52639 + Interview Questions in Secondary School in Chemistry

1.	Sodium hydroxide metal, acid name, non metal
Answer» ANSWER: non metal Explanation: coz metal and non metals are elements and this one is a compound of SODIUM (metal) with HYDROXIDE (radical).

1.

Sodium hydroxide metal, acid name, non metal

Answer»

ANSWER:

non metal

Explanation:

coz metal and non metals are elements and this one is a compound of SODIUM (metal) with HYDROXIDE (radical).

Discussion

2.	22 State how you would prove that HCl containsil hydrogen - using an active metal below magnesiumi) chlorine - using an oxidising agent not containing lead.
Answer» ANSWER: don't KNOW Explanation: don't know not IDEA for this QUESTION

2.

22 State how you would prove that HCl containsil hydrogen - using an active metal below magnesiumi) chlorine - using an oxidising agent not containing lead.

Answer»

ANSWER:

don't KNOW

Explanation:

don't know not IDEA for this QUESTION

Discussion

3.	Exothermic reaction among the following is
Answer» Answer: In thermodynamics, the term exothermic process describes a process or reaction that releases ENERGY from the system to its SURROUNDINGS, usually in the form of heat, but also in a form of light, ELECTRICITY, or sound. Explanation: Examples of Exothermic Reactions •any combustion reaction. •a NEUTRALIZATION reaction. •rusting of iron (rust steel wool with vinegar) the thermite reaction. •reaction between water and CALCIUM chloride. •reaction between sodium sulfite and bleach (dilute sodium hypochlorite) •reaction between potassium permanganate and glycerol.

3.

Exothermic reaction among the following is

Answer»

Answer:

In thermodynamics, the term exothermic process describes a process or reaction that releases ENERGY from the system to its SURROUNDINGS, usually in the form of heat, but also in a form of light, ELECTRICITY, or sound.

Explanation:

Examples of Exothermic Reactions

•any combustion reaction.

•a NEUTRALIZATION reaction.

•rusting of iron (rust steel wool with vinegar)

the thermite reaction.

•reaction between water and CALCIUM chloride.

•reaction between sodium sulfite and bleach (dilute sodium hypochlorite)

•reaction between potassium permanganate and glycerol.

Discussion

4.	Name three important chemicals made from sodium chloride?
Answer» ANSWER: SODIUM hydroxide, sodium CARBONATE and sodium hydrogencarbonate. Explanation: follow me pls

4.

Name three important chemicals made from sodium chloride?

Answer»

ANSWER:

SODIUM hydroxide, sodium CARBONATE and sodium hydrogencarbonate.

Explanation:

follow me pls

Discussion

5.	The example of solid in liquid state 1 mark
Answer» ANSWER: i THINK it will HELP you

5.

The example of solid in liquid state 1 mark

Answer»

ANSWER:

i THINK it will HELP you

Discussion

6.	Can the chemical formula be changes during the balancing of the equation
Answer» Answer: Balancing EQUATIONS. You cannot change subscripts in a chemical formula to balance a chemical equation; you can change only the coefficients. ... The coefficients indicate the number of each substance involved in the REACTION and MAY be CHANGED in ORDER to balance the equation.

6.

Can the chemical formula be changes during the balancing of the equation

Answer»

Answer:

Balancing EQUATIONS. You cannot change subscripts in a chemical formula to balance a chemical equation; you can change only the coefficients. ... The coefficients indicate the number of each substance involved in the REACTION and MAY be CHANGED in ORDER to balance the equation.

Discussion

7.	One mole of a substance represents1 pointAvogadro's number of particlesGram atomic weight22.4 L of volumeAll of the above
Answer» ANSWER: *All of the above* *hop*e it's HELPFUL

7.

One mole of a substance represents1 pointAvogadro's number of particlesGram atomic weight22.4 L of volumeAll of the above

Answer»

ANSWER:

All of the above

hope it's HELPFUL

Discussion

8.	The wavelength of radiation emitted, when in Heelectron falls from infinity to stationary state wouldbe (R = 1.097 * 107 m-)(1) 2.2 x 10-8 m (2) 2.2 * 10-9 m(3) 120 m(4) 22 x 107 m
Answer» ANSWER: the WAVELENGTH of radiation emitted when in he ELECTION 4)22*107 m

8.

The wavelength of radiation emitted, when in Heelectron falls from infinity to stationary state wouldbe (R = 1.097 * 107 m-)(1) 2.2 x 10-8 m (2) 2.2 * 10-9 m(3) 120 m(4) 22 x 107 m

Answer»

ANSWER:

the WAVELENGTH of radiation emitted when in he ELECTION 4)22*107 m

Discussion

9.	(a ) Which of the following is not a mixture :1 . Iodized table salt,2 . Gasoline ,3 . L.P.G4 . Distilled water,(b ) One "U ' stands for the mass,1 . An atom of carbon 12,2 . 1/12th of the carbon,3. 1/12th of hydrogen atom,4 . One atom of any of the element ,(c ) The law of definite composition was proposed by ,1 . Lomonosov2 . Antoine Lavoisier3 . Joseph Proust4 . Dalton( d ) Mathematically Boyle's law shown by all of the following except,1 . PV =k2 . PT = k3 . P1V1 = P2V24 . V = k/p(e ). Avogadro law distinguish between,1 . Cations and anion2 . Atoms and molecule3 . Atoms and ions4 . Molecules and ions.
Answer» ANSWER: don't KNOW if you know than if you don't than SEE in GOOGLE

9.

(a ) Which of the following is not a mixture :1 . Iodized table salt,2 . Gasoline ,3 . L.P.G4 . Distilled water,(b ) One "U ' stands for the mass,1 . An atom of carbon 12,2 . 1/12th of the carbon,3. 1/12th of hydrogen atom,4 . One atom of any of the element ,(c ) The law of definite composition was proposed by ,1 . Lomonosov2 . Antoine Lavoisier3 . Joseph Proust4 . Dalton( d ) Mathematically Boyle's law shown by all of the following except,1 . PV =k2 . PT = k3 . P1V1 = P2V24 . V = k/p(e ). Avogadro law distinguish between,1 . Cations and anion2 . Atoms and molecule3 . Atoms and ions4 . Molecules and ions.

Answer»

ANSWER:

don't KNOW if you know than if you don't than SEE in GOOGLE

Discussion

10.	What does one mean by exothermic and endothermic reactions? Giveexamples.
Answer» ★ ENDOTHERMIC REACTION :- The reaction in which heat is absorbed is called as endothermic reaction. ◾Endothermic reaction is opposite to exothermic reaction. ◾In this PROCESS, there is the increase in the enthalpy H. ◾Example → photosynthesis : It is an example of endothermic reaction because it absorbs heat energy from the sunlight. ★ Exothermic reaction :- The reaction in which heat is released is called as exothermic reaction. ◾Exothermic reaction is opposite to endothermic reaction. ◾In this process, heat is released and the replacement of weak bonds with stronger ones takes place. ◾Example → the BURNING of the NATURAL gas.

10.

What does one mean by exothermic and endothermic reactions? Giveexamples.

Answer»

★ ENDOTHERMIC REACTION :-

The reaction in which heat is absorbed is called as endothermic reaction.

◾Endothermic reaction is opposite to exothermic reaction.

◾In this PROCESS, there is the increase in the enthalpy H.

◾Example → photosynthesis : It is an example of endothermic reaction because it absorbs heat energy from the sunlight.

★ Exothermic reaction :-

The reaction in which heat is released is called as exothermic reaction.

◾Exothermic reaction is opposite to endothermic reaction.

◾In this process, heat is released and the replacement of weak bonds with stronger ones takes place.

◾Example → the BURNING of the NATURAL gas.

Discussion

11.	A sugar solutions with concentration of 8.5% (w/w) is made by dissolving 'x' gram of sugar in 450 grams of water the Amount of X isA. 49.2 gB. 45.3 gC. 41.80 gD. 35 g
Answer» Answer: 35g Explanation: w/w×100 x/450×100=8.5% 35 hope it HELPS you please MARK it as brainlist follow me also thank you in advance

11.

A sugar solutions with concentration of 8.5% (w/w) is made by dissolving 'x' gram of sugar in 450 grams of water the Amount of X isA. 49.2 gB. 45.3 gC. 41.80 gD. 35 g

Answer»

Answer:

35g

Explanation:

w/w×100

x/450×100=8.5%

35

hope it HELPS you

please MARK it as brainlist

follow me also

thank you in advance

Discussion

12.	The elements and compounds together are called
Answer» the ELEMENTS and compounds together CALLED PURE SUBSTANCES

Discussion

13.	The ratio of equivalent in 54 gm Al and 48 gm of oxygen
Answer» ANSWER: MARK me brainlist Explanation: FOLLOW me please

13.

The ratio of equivalent in 54 gm Al and 48 gm of oxygen

Answer»

ANSWER:

MARK me brainlist

Explanation:

FOLLOW me

please

Discussion

14.	1.08 g of metal oxide on being reduced with hydrogen gives 1 g of metal. Calculate the equivalent weight of the metal.
Answer» Explanation: 3 tabhat do you know about The Longwalk. to Exadesin? Aintroductory statement in a congitution whicaia the seasons and guiding VALUES of the COHEN did fouth AFRICA becsne odemosstic country? should be 6 Leaders of the frudom movement were cle Hu 7 ONE of the guiding uslings of the constitution i sovereiganty which l

14.

1.08 g of metal oxide on being reduced with hydrogen gives 1 g of metal. Calculate the equivalent weight of the metal.

Answer»

Explanation:

3 tabhat do you know about The Longwalk. to Exadesin?

Aintroductory statement in a congitution whicaia

the seasons and guiding VALUES of the COHEN did fouth AFRICA becsne odemosstic country?

should be

6 Leaders of the frudom movement were cle Hu

7 ONE of the guiding uslings of the constitution i sovereiganty

which l

Discussion

15.	DIFFERENCE BETWEEN PHYSCIAL AND CHEMICAL ADSORPATION
Answer» Physical adsorption It TAKES places at low temperature and DECREASES with increase in temperature Van DER Waals force is the force helding the adsorbate it is reversible Not specific it forms a multimolecular layer It is dependent of pressure and temperature examples Clay, silica gel Chemical Adsorption It is specific in nature it involves chemical bonds between the gas molecules and the adsorbent SURFACE it requires a certain level of energy of activation The RATE of chemical adsorption is directly proportional to the surface area it forms a unimolecular layer It is reversible in nature It is slow at low temperature and occurs at a higher rate with an increase in pressure example: Rubbing pain balm on the forehead

Discussion

16.	Why magnesium is highly reactive than aluminium
Answer» In a REACTIVITY series, the most reactive element is placed at the top and the least reactive element at the BOTTOM. More reactive metals have a greater tendency to lose ELECTRONS and form positive ions. # STAY SAFE ☺️✌️ PLEASE MARK IT AS BRAINLIEST............

16.

Why magnesium is highly reactive than aluminium

Answer»

In a REACTIVITY series, the most reactive element is placed at the top and the least reactive element at the BOTTOM. More reactive metals have a greater tendency to lose ELECTRONS and form positive ions.

# STAY SAFE ☺️✌️

PLEASE MARK IT AS BRAINLIEST............

Discussion

17.	A substance that decompose on heating
Answer» Answer: Thermal decomposition, or thermolysis, is a chemical decomposition caused by heat. The decomposition temperature of a substance is the temperature at which the substance chemically DECOMPOSES. The REACTION is usually endothermic as heat is required to break chemical bonds in the compound undergoing decomposition. If decomposition is sufficiently exothermic, a positive feedback loop is CREATED producing thermal runaway and possibly an explosion or other chemical reactions. Explanation: hope it HELP u dear FOLLOW me

17.

A substance that decompose on heating

Answer»

Answer:

Thermal decomposition, or thermolysis, is a chemical decomposition caused by heat. The decomposition temperature of a substance is the temperature at which the substance chemically DECOMPOSES. The REACTION is usually endothermic as heat is required to break chemical bonds in the compound undergoing decomposition. If decomposition is sufficiently exothermic, a positive feedback loop is CREATED producing thermal runaway and possibly an explosion or other chemical reactions.

Explanation:

hope it HELP u dear

FOLLOW me

Discussion

18.	The sex ratio in India was 940 in 2011, but it was 914 in the 0-6 years' age group. Whatmay be the reasons for this?5.The literacy rate of women in India is lower than that of men. What are the reasons for
Answer» Answer: THE LITERACY RATE IN INDIA FOR WOMEN IS LESS BECAUSE PEOPLE THINK THAT WOMEN'S DON'T HAVE THE RIGHT TO EDUCATION SO IN SOME VILLAGES THEY DO NOT ALLOW THEM TO BE LITERATE

18.

The sex ratio in India was 940 in 2011, but it was 914 in the 0-6 years' age group. Whatmay be the reasons for this?5.The literacy rate of women in India is lower than that of men. What are the reasons for

Answer»

Answer:

THE LITERACY RATE IN INDIA FOR WOMEN IS LESS BECAUSE PEOPLE THINK THAT WOMEN'S DON'T HAVE THE RIGHT TO EDUCATION SO IN SOME VILLAGES THEY DO NOT ALLOW THEM TO BE LITERATE

Discussion

19.	What is meant by combination reaction? Explain it with a suitableexample.
Answer» Explanation: Combination reaction is the Reaction N which A SINGLE compound Combine to FORMED a reaction .. CALLED Combination reaction...

19.

What is meant by combination reaction? Explain it with a suitableexample.

Answer»

Explanation:

Combination reaction is the Reaction N which A SINGLE compound Combine to FORMED a reaction ..

CALLED Combination reaction...

Discussion

20.	सब्सटेंस दैट कैन बी कंपोज्ड बाय ईटिंग
Answer» Answer: this TYPES of Americans are KNOWN as EATABLES DANCE

20.

सब्सटेंस दैट कैन बी कंपोज्ड बाय ईटिंग

Answer»

Answer:

this TYPES of Americans are KNOWN as EATABLES DANCE

Discussion

21.	State and explain Avogadros law
Answer» Explanation: hi Avogadro's law is an experimental gas law relating the volume of a gas to the amount of SUBSTANCE of gas present. The law is a specific CASE of the ideal gas law. A modern statement is: Avogadro's law STATES that "equal VOLUMES of all gases, at the same temperature and pressure, have the same number of MOLECULES." mark me as brainlist

21.

State and explain Avogadros law

Answer»

Explanation:

hi

Avogadro's law is an experimental gas law relating the volume of a gas to the amount of SUBSTANCE of gas present. The law is a specific CASE of the ideal gas law. A modern statement is: Avogadro's law STATES that "equal VOLUMES of all gases, at the same temperature and pressure, have the same number of MOLECULES."

mark me as brainlist

Discussion

22.	Pls answer this one step by step
Answer» ANSWER: B ......................

22.

Pls answer this one step by step

Answer»

ANSWER:

B ......................

Discussion

23.	the concentration of a 200 g salt soln is 10% if 20 g more water is added what will the concentration become
Answer» ANSWER: The new CONCENTRATION of SOLUTION = 0.91 %. GIVEN: Weight of solute = 200 g. The concentration of salt solution is 10%. 20 g more WATER is added. TO FIND: The new concentration of solution. EXPLANATION: Water acts as the solvent as it is given that 20 g more water is added. Salt acts as solute because it is in lesser amount by weight when compared to water. $\boxed{\large{\bold{Weight \ \% = \dfrac{weight\ of\ solute}{weight\ of\ solution}\times 100}}}$ Weight percentage = 10 % Weight of solute = 20 g Weight of solution = Weight of solute + Weight of solvent Let Weight of solvent be x Weight of solution = (20 + x ) g $\sf 10 = \dfrac{20}{20 + x}\times 100$ $\sf 1 = \dfrac{20}{20 + x}\times 10$ $\sf 20 + x = 200$ $\sf x = 180 \ g$ Weight of solvent(water) = 180 g When 20 g more water is added. New Weight of solvent(water) = 200 g $\boxed{\large{\bold{Weight \ \% = \dfrac{weight\ of\ solute}{weight\ of\ solution}\times 100}}}$ Weight of solution = 200 + 20 = 220 g Weight of solute = 20 g $\sf Weight \ \% = \dfrac{20}{220}\times 100$ $\sf Weight \ \% = \dfrac{20}{22}\times 10$ $\sf Weight \ \% = \dfrac{1}{11}\times 10$ $\sf Weight \ \% = 0.91\ \%$ HENCE THE CONCENTRATION WILL BE 0.91 %.

23.

the concentration of a 200 g salt soln is 10% if 20 g more water is added what will the concentration become

Answer»

ANSWER:

The new CONCENTRATION of SOLUTION = 0.91 %.

GIVEN:

Weight of solute = 200 g.

The concentration of salt solution is 10%.

20 g more WATER is added.

TO FIND:

The new concentration of solution.

EXPLANATION:

Water acts as the solvent as it is given that 20 g more water is added.

Salt acts as solute because it is in lesser amount by weight when compared to water.

$\boxed{\large{\bold{Weight \ \% = \dfrac{weight\ of\ solute}{weight\ of\ solution}\times 100}}}$

Weight percentage = 10 %

Weight of solute = 20 g

Weight of solution = Weight of solute + Weight of solvent

Let Weight of solvent be x

Weight of solution = (20 + x ) g

$\sf 10 = \dfrac{20}{20 + x}\times 100$

$\sf 1 = \dfrac{20}{20 + x}\times 10$

$\sf 20 + x = 200$

$\sf x = 180 \ g$

Weight of solvent(water) = 180 g

When 20 g more water is added.

New Weight of solvent(water) = 200 g

$\boxed{\large{\bold{Weight \ \% = \dfrac{weight\ of\ solute}{weight\ of\ solution}\times 100}}}$

Weight of solution = 200 + 20 = 220 g

Weight of solute = 20 g

$\sf Weight \ \% = \dfrac{20}{220}\times 100$

$\sf Weight \ \% = \dfrac{20}{22}\times 10$

$\sf Weight \ \% = \dfrac{1}{11}\times 10$

$\sf Weight \ \% = 0.91\ \%$

HENCE THE CONCENTRATION WILL BE 0.91 %.

Discussion

24.	Which of the following is/are not homogeneous mixtures/solutions? (i) Water in alcohol (ii) Sulphur in carbon disulphide (iii) Water in oil (iv) Vinegar (v) Sand in water
Answer» ANSWER: Explanation water in ALCOHOL is answer

24.

Which of the following is/are not homogeneous mixtures/solutions? (i) Water in alcohol (ii) Sulphur in carbon disulphide (iii) Water in oil (iv) Vinegar (v) Sand in water

Answer»

ANSWER:

Explanation

water in ALCOHOL is answer

Discussion

25.	Whatis balometer System
Answer» Answer: Balometer is a DEVICE USED for measuring the volume of air coming out of diffusers in HVAC systems. pls mark my answer as BRAINLIEST

25.

Whatis balometer System

Answer»

Answer:

Balometer is a DEVICE USED for measuring the volume of air coming out of diffusers in HVAC systems.

pls mark my answer as BRAINLIEST

Discussion

26.	4. In osmosis :(a) Solute moves through semi permeable membrane.(b) Solvent moves through semi permeable membrane.(c) Both solute and solvent moves through semi permeable membrane.(d) Solution moves through semi permeable membrane.
Answer» EXPLANATION: OPTION A is the CORRECT answer *hope it HELPS you*

26.

4. In osmosis :(a) Solute moves through semi permeable membrane.(b) Solvent moves through semi permeable membrane.(c) Both solute and solvent moves through semi permeable membrane.(d) Solution moves through semi permeable membrane.

Answer»

EXPLANATION:

OPTION A is the CORRECT answer

hope it HELPS you

Discussion

27.	. If you have polystyrene, how can show its conformers and their thermodynamic stability.
Answer» Answer: Explanation: The local conformation of polystyrene (PS) and deuterated PS at the interface ... the randomization of side GROUPS to seek their quasi-equilibrium states. ... It is apparent that the surface with an area FRACTION of PHENYL groups in the ... not so large, if any, or OTHERWISE the π–π interactions are not present PLEASE mark as brainliest

27.

. If you have polystyrene, how can show its conformers and their thermodynamic stability.

Answer»

Answer:

Explanation:

The local conformation of polystyrene (PS) and deuterated PS at the interface ... the randomization of side GROUPS to seek their quasi-equilibrium states. ... It is apparent that the surface with an area FRACTION of PHENYL groups in the ... not so large, if any, or OTHERWISE the π–π interactions are not present

PLEASE mark as brainliest

Discussion

28.	Four gases like and have Henry’s constant values are 69.16,144.97,0.413 and 1.67. The gas which is more soluble in liquid is
Answer» Liquids and solids exhibit practically no change of solubility with changes in pressure. GASES as might be expected, increase in solubility with an increase in pressure. Henry's Law STATES that: The solubility of a gas in a liquid is directly PROPORTIONAL to the pressure of that gas above the surface of the solution Liquids and solids exhibit practically no change of solubility with changes in pressure. Gases as might be expected, increase in solubility with an increase in pressure. Henry's Law states that: The solubility of a gas in a liquid is directly proportional to the pressure of that gas above the surface of the solution.As value of Kh increases mole fraction of gas soluble in solvent DECREASES. Kh increases with increases in temperature so solubility decreases with increase in temperature. Different gases have different Kh value so the gas which has high Kh value , has low solubility into the solvent Liquids and solids exhibit practically no change of solubility with changes in pressure. Gases as might be expected, increase in solubility with an increase in pressure. Henry's Law states that: The solubility of a gas in a liquid is directly proportional to the pressure of that gas above the surface of the solution.As value of Kh increases mole fraction of gas soluble in solvent decreases. Kh increases with increases in temperature so solubility decreases with increase in temperature. Different gases have different Kh value so the gas which has high Kh value , has low solubility into the solvent The law states that at a constant temperature, the solubility (S) of a gas in a liquid is directly proportional to the pressure (P) of the gas. Thus the solubility of gas at unit pressure is equal to Henry's constant. ... Different gases have different KH values at the same temperature. *Hope* *you* *understand*

28.

Four gases like and have Henry’s constant values are 69.16,144.97,0.413 and 1.67. The gas which is more soluble in liquid is

Answer»

Liquids and solids exhibit practically no change of solubility with changes in pressure. GASES as might be expected, increase in solubility with an increase in pressure. Henry's Law STATES that: The solubility of a gas in a liquid is directly PROPORTIONAL to the pressure of that gas above the surface of the solution

Liquids and solids exhibit practically no change of solubility with changes in pressure. Gases as might be expected, increase in solubility with an increase in pressure. Henry's Law states that: The solubility of a gas in a liquid is directly proportional to the pressure of that gas above the surface of the solution.As value of Kh increases mole fraction of gas soluble in solvent DECREASES. Kh increases with increases in temperature so solubility decreases with increase in temperature. Different gases have different Kh value so the gas which has high Kh value , has low solubility into the solvent

Liquids and solids exhibit practically no change of solubility with changes in pressure. Gases as might be expected, increase in solubility with an increase in pressure. Henry's Law states that: The solubility of a gas in a liquid is directly proportional to the pressure of that gas above the surface of the solution.As value of Kh increases mole fraction of gas soluble in solvent decreases. Kh increases with increases in temperature so solubility decreases with increase in temperature. Different gases have different Kh value so the gas which has high Kh value , has low solubility into the solvent The law states that at a constant temperature, the solubility (S) of a gas in a liquid is directly proportional to the pressure (P) of the gas. Thus the solubility of gas at unit pressure is equal to Henry's constant. ... Different gases have different KH values at the same temperature.

Hope you understand

Discussion

29.	Carbon,sulphur,watcher,phosphore which is odd one out
Answer» Answer: CARBON Explanation: BCOZ ALL ARE MOLECULES EXCEPT CARBON PLZ MARK ME BRAINLIEST!!! THANK YOU!

29.

Carbon,sulphur,watcher,phosphore which is odd one out

Answer»

Answer:

CARBON

Explanation:

BCOZ ALL ARE MOLECULES EXCEPT CARBON

PLZ MARK ME BRAINLIEST!!!

THANK YOU!

Discussion

30.	Which of the following present in nitric acid 1.hydrogen 2. carbon dioxide3.oxygen4.nitrogen5. none of these
Answer» Answer: 4. NONE of the above Explanation: because because OXIDE of NITROGEN is present in nitric ACID

30.

Which of the following present in nitric acid 1.hydrogen 2. carbon dioxide3.oxygen4.nitrogen5. none of these

Answer»

Answer:

4. NONE of the above

Explanation:

because because OXIDE of NITROGEN is present in nitric ACID

Discussion

31.	Whaty makes the nucleus of a hydrogen atom different from the nucleus of all other elements?
Answer» Answer: A NORMAL hydrogen (H) atom does not have any NEUTRONS in its TINY nucleus. That tiny little atom (the tiniest of all) has only one electron and one PROTON. You can take away the electron and make an ion, but you can't take away any neutrons.

31.

Whaty makes the nucleus of a hydrogen atom different from the nucleus of all other elements?

Answer»

Answer:

A NORMAL hydrogen (H) atom does not have any NEUTRONS in its TINY nucleus. That tiny little atom (the tiniest of all) has only one electron and one PROTON. You can take away the electron and make an ion, but you can't take away any neutrons.

Discussion

32.	What is screening effect
Answer» Answer: SCREENING effect is an effect is observed in an atom having more ELECTRONS and PARTICULARLY more electron SHELLS.

32.

What is screening effect

Answer»

Answer:

SCREENING effect is an effect is observed in an atom having more ELECTRONS and PARTICULARLY more electron SHELLS.

Discussion

33.	fire burn with the help of oxygen and in space their is no oxygen so how is sun burning in space cotinuously ??
Answer» ➠ AnSwer :- → The Sun does not "BURN", like we think of logs in a fire or paper burning. → The Sun GLOWS because it is a very BIG ball of gas, and a process called nuclear FUSION is taking place in its core. → Hydrogen really doesn't burn, it fuses, into helium. → So no oxygen is required!

33.

fire burn with the help of oxygen and in space their is no oxygen so how is sun burning in space cotinuously ??

Answer»

➠ AnSwer :-

→ The Sun does not "BURN", like we think of logs in a fire or paper burning.

→ The Sun GLOWS because it is a very BIG ball of gas, and a process called nuclear FUSION is taking place in its core.

→ Hydrogen really doesn't burn, it fuses, into helium.

→ So no oxygen is required!

Discussion

34.	Which of the following terms are unitless(i) Molality(ii) Molarity(iii)molefraction (iv) mass percent
Answer» ANSWER: both MASS PERCENT and MOLE FRACTION

34.

Which of the following terms are unitless(i) Molality(ii) Molarity(iii)molefraction (iv) mass percent

Answer»

ANSWER:

both MASS PERCENT and MOLE FRACTION

Discussion

35.	HOW MANY ELECTRON IN ARGON HAVE m=20?
Answer» Answer 18 Explanation:

35.

HOW MANY ELECTRON IN ARGON HAVE m=20?

Answer»

Answer

18

Explanation:

Discussion

36.	Why does a solid on heating gets converted into a liquid
Answer» EXPLANATION: Because SOLID change into a liquid . ON IT HEATING FORCE IS EXERTED

36.

Why does a solid on heating gets converted into a liquid

Answer»

EXPLANATION:

Because SOLID change into a liquid . ON IT HEATING FORCE IS EXERTED

Discussion

37.	Maxium volume at N.T.P is occupied by
Answer» ANSWER: the MAXIUM volume at n.t.p. is occupied by -(a) 12.8 gm of so (c) 0,5 mol of NO2 (b) 6.02×1022 mole CULES of CH.

37.

Maxium volume at N.T.P is occupied by

Answer»

ANSWER:

the MAXIUM volume at n.t.p. is occupied by -(a) 12.8 gm of so (c) 0,5 mol of NO2 (b) 6.02×1022 mole CULES of CH.

Discussion

38.	Which type of semiconductor is produce when silicon is doped with Ga
Answer» Explanation: hi p-type When silicon is doped with B or GA, a p-type (positive) SEMICONDUCTOR is obtained. The electrical conductivity is enhanced due to CREATION of a hole. The substitution of Si with Ga produces an ELECTRON deficit SITE or a hole. An electron moves into this hole and produces another hole. mark me as brainlist

38.

Which type of semiconductor is produce when silicon is doped with Ga

Answer»

Explanation:

hi

p-type

When silicon is doped with B or GA, a p-type (positive) SEMICONDUCTOR is obtained. The electrical conductivity is enhanced due to CREATION of a hole. The substitution of Si with Ga produces an ELECTRON deficit SITE or a hole. An electron moves into this hole and produces another hole.

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Discussion

39.	in science h2O is water mean water have oxygen and if water have oxygen then why we donot breadth in water
Answer» Because we don’t have GILLS or SPECIAL SKIN

Discussion

40.	1. Name the alkane which has three carbon atoms?2. Define Isomers?3. Describe the structures of ethane, ethene and ethyneplease give the answers of these three questions
Answer» Explanation: n-pentane In chemistry, isomers are MOLECULES or polyatomic ions with identical chemical formulas but distinct arrangements of ATOMS in space. Isomers do not necessarily share similar properties. Two main forms of isomerism are structural isomerism and stereoisomerism. Ethane, ethene, and ethyne are three (3) different molecules containing two (2) carbon atoms apiece. The formulas are C2H6, C2H4, and C2H2, respectively. A. The two (2) carbons are single, double, and triple bonded with each other in ethane, ethene, and ethyne, respectively. mark as brainliest... PLZ follow me...

40.

1. Name the alkane which has three carbon atoms?2. Define Isomers?3. Describe the structures of ethane, ethene and ethyneplease give the answers of these three questions

Answer»

Explanation:

n-pentane
In chemistry, isomers are MOLECULES or polyatomic ions with identical chemical formulas but distinct arrangements of ATOMS in space. Isomers do not necessarily share similar properties. Two main forms of isomerism are structural isomerism and stereoisomerism.
Ethane, ethene, and ethyne are three (3) different molecules containing two (2) carbon atoms apiece. The formulas are C2H6, C2H4, and C2H2, respectively. A. The two (2) carbons are single, double, and triple bonded with each other in ethane, ethene, and ethyne, respectively.

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PLZ follow me...

Discussion

41.	If you have ethylene glycol, epichlorohydrin, bischloromethyl ether what will be the polymer formed from each monomer and mixture of all these. Chemically show it
Answer» Answer: Explanation: Copolymerization OFFERS flexibility with RESPECT to possible monomers and a great diversity of polymeric products, but also COMPOSITION drift, which may NEED to be minimized or exploited in a controlled way, for specific structure–property relationships. Many copolymerization mathematical models can do a sufficiently good job for several macroscopic reactor outputs, but how about predicting microstructural properties reliably? What is the role of key copolymerization parameters? This article will hopefully offer a good overview of the main aspects of copolymerization, which can serve as a good starting POINT for the novice and a good summary of issues to be explored further for the expert.

41.

If you have ethylene glycol, epichlorohydrin, bischloromethyl ether what will be the polymer formed from each monomer and mixture of all these. Chemically show it

Answer»

Answer:

Explanation:

Copolymerization OFFERS flexibility with RESPECT to possible monomers and a great diversity of polymeric products, but also COMPOSITION drift, which may NEED to be minimized or exploited in a controlled way, for specific structure–property relationships. Many copolymerization mathematical models can do a sufficiently good job for several macroscopic reactor outputs, but how about predicting microstructural properties reliably? What is the role of key copolymerization parameters? This article will hopefully offer a good overview of the main aspects of copolymerization, which can serve as a good starting POINT for the novice and a good summary of issues to be explored further for the expert.

Discussion

42.	Explain with equation in effect of heating on1 - lead nitrate2 - sodium nitrate
Answer» ANSWER: they are metals I don't THINK to TELL u more u can understand if they are metals

42.

Explain with equation in effect of heating on1 - lead nitrate2 - sodium nitrate

Answer»

ANSWER:

they are metals I don't THINK to TELL u more u can understand if they are metals

Discussion

43.	Calculate theenergyin calories required to produce from neutral He atoms 1 mole of He+ ions He++ ions using Bohr's equation
Answer» ANSWER: HAL GA dnfm fwbsbxbxnx ND nsjdncnynx

43.

Calculate theenergyin calories required to produce from neutral He atoms 1 mole of He+ ions He++ ions using Bohr's equation

Answer»

ANSWER:

HAL GA dnfm

fwbsbxbxnx ND nsjdncnynx

Discussion

44.	Mcq question for class VII chemistry chapter atomic structure
Answer» Answer: ATOMIC structure chapter is a basic chapter of CLASS 7th Explanation: . . .... and ATOM is electrically NEUTRAL

44.

Mcq question for class VII chemistry chapter atomic structure

Answer»

Answer:

ATOMIC structure chapter is a basic chapter of CLASS 7th

Explanation:

.

.... and ATOM is electrically NEUTRAL

Discussion

45.	2450 gram of glucose is presentin 5oog of water. Express theConcentration of solute in mass%
Answer» $concentration \: of \: solute \\ \\ = \frac{mass \: of \: solute}{total \: mass} \times 100 \\ \\ = \frac{50}{500} \times 100 \\ \\ = 10\%$ MARK as BRAINLIEST.........

Discussion

46.	What is observed when cuco3 is heated
Answer» Answer: Investigating what happens when a COMPOUND copper CARBONATE is HEATED. When green copper carbonate{CUCO3} is heated it decomposes forming copper oxide {CuO} and carbon dioxide {CO2}.

46.

What is observed when cuco3 is heated

Answer»

Answer:

Investigating what happens when a COMPOUND copper CARBONATE is HEATED. When green copper carbonate{CUCO3} is heated it decomposes forming copper oxide {CuO} and carbon dioxide {CO2}.

Discussion

47.	Question 10:27. The bonding ofthe activated complex ischaracteristic of a reactants only.c. both reactants and products. b.products only. d. solids only.Choose correct option
Answer» ANSWER: CHARACTERISTIC of a REACTANTS only.

47.

Question 10:27. The bonding ofthe activated complex ischaracteristic of a reactants only.c. both reactants and products. b.products only. d. solids only.Choose correct option

Answer»

ANSWER:

CHARACTERISTIC of a REACTANTS only.

Discussion

48.	What is bthe meaning of kunji nakki?
Answer» . वह उपकरण जिससे ताला खुलता है; चाभी follow me

48.

What is bthe meaning of kunji nakki?

Answer»

. वह उपकरण जिससे ताला खुलता है; चाभी

follow me

Discussion

49.	Why does human being want live together in a society
Answer» Explanation: MAN is biologically and phsychologically EQUIPPED to live in GROUPS , in society.

49.

Why does human being want live together in a society

Answer»

Explanation:

MAN is biologically and phsychologically EQUIPPED to live in GROUPS , in society.

Discussion

50.	Nitric acid Natural source
Answer» EXPLANATION: BEAT ROOTS GARLIC MEAT DARK CHOCOLATE LEAFY GREENS CITRUS FRUITS POMEGRANATE NUTS AND SEEDS

50.

Nitric acid Natural source

Answer»

EXPLANATION:

BEAT ROOTS
GARLIC
MEAT
DARK CHOCOLATE
LEAFY GREENS
CITRUS FRUITS
POMEGRANATE
NUTS AND SEEDS

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Sodium hydroxide metal, acid name, non metal

22 State how you would prove that HCl containsil hydrogen - using an active metal below magnesiumi) chlorine - using an oxidising agent not containing lead.​

Exothermic reaction among the following is​

Name three important chemicals made from sodium chloride?​

The example of solid in liquid state 1 mark​

Can the chemical formula be changes during the balancing of the equation​

One mole of a substance represents1 pointAvogadro's number of particlesGram atomic weight22.4 L of volumeAll of the above​

The wavelength of radiation emitted, when in Heelectron falls from infinity to stationary state wouldbe (R = 1.097 * 107 m-)(1) 2.2 x 10-8 m (2) 2.2 * 10-9 m(3) 120 m(4) 22 x 107 m​

What does one mean by exothermic and endothermic reactions? Giveexamples.​

★ ENDOTHERMIC REACTION :-

★ Exothermic reaction :-

A sugar solutions with concentration of 8.5% (w/w) is made by dissolving 'x' gram of sugar in 450 grams of water the Amount of X isA. 49.2 gB. 45.3 gC. 41.80 gD. 35 g​

The elements and compounds together are called

The ratio of equivalent in 54 gm Al and 48 gm of oxygen

1.08 g of metal oxide on being reduced with hydrogen gives 1 g of metal. Calculate the equivalent weight of the metal.

DIFFERENCE BETWEEN PHYSCIAL AND CHEMICAL ADSORPATION

Why magnesium is highly reactive than aluminium

# STAY SAFE ☺️✌️

A substance that decompose on heating​

The sex ratio in India was 940 in 2011, but it was 914 in the 0-6 years' age group. Whatmay be the reasons for this?5.The literacy rate of women in India is lower than that of men. What are the reasons for​

What is meant by combination reaction? Explain it with a suitableexample.​

सब्सटेंस दैट कैन बी कंपोज्ड बाय ईटिंग​

State and explain Avogadros law​

Pls answer this one step by step​

the concentration of a 200 g salt soln is 10% if 20 g more water is added what will the concentration become

ANSWER:

GIVEN:

TO FIND:

EXPLANATION:

Which of the following is/are not homogeneous mixtures/solutions? (i) Water in alcohol (ii) Sulphur in carbon disulphide (iii) Water in oil (iv) Vinegar (v) Sand in water

Whatis balometer System​

4. In osmosis :(a) Solute moves through semi permeable membrane.(b) Solvent moves through semi permeable membrane.(c) Both solute and solvent moves through semi permeable membrane.(d) Solution moves through semi permeable membrane.​

. If you have polystyrene, how can show its conformers and their thermodynamic stability.​

Four gases like and have Henry’s constant values are 69.16,144.97,0.413 and 1.67. The gas which is more soluble in liquid is

Hope you understand

Carbon,sulphur,watcher,phosphore which is odd one out

Which of the following present in nitric acid 1.hydrogen 2. carbon dioxide3.oxygen4.nitrogen5. none of these

Whaty makes the nucleus of a hydrogen atom different from the nucleus of all other elements?

What is screening effect​

fire burn with the help of oxygen and in space their is no oxygen so how is sun burning in space cotinuously ??​

➠ AnSwer :-

Which of the following terms are unitless(i) Molality(ii) Molarity(iii)molefraction (iv) mass percent​

HOW MANY ELECTRON IN ARGON HAVE m=20?​

Why does a solid on heating gets converted into a liquid​

Maxium volume at N.T.P is occupied by ​

Which type of semiconductor is produce when silicon is doped with Ga​

p-type

When silicon is doped with B or GA, a p-type (positive) SEMICONDUCTOR is obtained. The electrical conductivity is enhanced due to CREATION of a hole. The substitution of Si with Ga produces an ELECTRON deficit SITE or a hole. An electron moves into this hole and produces another hole.

in science h2O is water mean water have oxygen and if water have oxygen then why we donot breadth in water​

1. Name the alkane which has three carbon atoms?2. Define Isomers?3. Describe the structures of ethane, ethene and ethyneplease give the answers of these three questions​

If you have ethylene glycol, epichlorohydrin, bischloromethyl ether what will be the polymer formed from each monomer and mixture of all these. Chemically show it​

Explain with equation in effect of heating on1 - lead nitrate2 - sodium nitrate​

Calculate theenergyin calories required to produce from neutral He atoms 1 mole of He+ ions He++ ions using Bohr's equation​

Mcq question for class VII chemistry chapter atomic structure

2450 gram of glucose is presentin 5oog of water. Express theConcentration of solute in mass%​

What is observed when cuco3 is heated​

Investigating what happens when a COMPOUND copper CARBONATE is HEATED. When green copper carbonate{CUCO3} is heated it decomposes forming copper oxide {CuO} and carbon dioxide {CO2}.

Question 10:27. The bonding ofthe activated complex ischaracteristic of a reactants only.c. both reactants and products. b.products only. d. solids only.Choose correct option​

What is bthe meaning of kunji nakki?

Why does human being want live together in a society

Nitric acid Natural source

22 State how you would prove that HCl containsil hydrogen - using an active metal below magnesiumi) chlorine - using an oxidising agent not containing lead.

Exothermic reaction among the following is

Name three important chemicals made from sodium chloride?

The example of solid in liquid state 1 mark

Can the chemical formula be changes during the balancing of the equation

One mole of a substance represents1 pointAvogadro's number of particlesGram atomic weight22.4 L of volumeAll of the above

The wavelength of radiation emitted, when in Heelectron falls from infinity to stationary state wouldbe (R = 1.097 * 107 m-)(1) 2.2 x 10-8 m (2) 2.2 * 10-9 m(3) 120 m(4) 22 x 107 m

What does one mean by exothermic and endothermic reactions? Giveexamples.

A sugar solutions with concentration of 8.5% (w/w) is made by dissolving 'x' gram of sugar in 450 grams of water the Amount of X isA. 49.2 gB. 45.3 gC. 41.80 gD. 35 g

A substance that decompose on heating

The sex ratio in India was 940 in 2011, but it was 914 in the 0-6 years' age group. Whatmay be the reasons for this?5.The literacy rate of women in India is lower than that of men. What are the reasons for

What is meant by combination reaction? Explain it with a suitableexample.

सब्सटेंस दैट कैन बी कंपोज्ड बाय ईटिंग

State and explain Avogadros law

Pls answer this one step by step

Whatis balometer System

4. In osmosis :(a) Solute moves through semi permeable membrane.(b) Solvent moves through semi permeable membrane.(c) Both solute and solvent moves through semi permeable membrane.(d) Solution moves through semi permeable membrane.

. If you have polystyrene, how can show its conformers and their thermodynamic stability.

What is screening effect

fire burn with the help of oxygen and in space their is no oxygen so how is sun burning in space cotinuously ??

Which of the following terms are unitless(i) Molality(ii) Molarity(iii)molefraction (iv) mass percent

HOW MANY ELECTRON IN ARGON HAVE m=20?

Why does a solid on heating gets converted into a liquid

Maxium volume at N.T.P is occupied by

Which type of semiconductor is produce when silicon is doped with Ga

in science h2O is water mean water have oxygen and if water have oxygen then why we donot breadth in water

1. Name the alkane which has three carbon atoms?2. Define Isomers?3. Describe the structures of ethane, ethene and ethyneplease give the answers of these three questions

If you have ethylene glycol, epichlorohydrin, bischloromethyl ether what will be the polymer formed from each monomer and mixture of all these. Chemically show it

Explain with equation in effect of heating on1 - lead nitrate2 - sodium nitrate

Calculate theenergyin calories required to produce from neutral He atoms 1 mole of He+ ions He++ ions using Bohr's equation

2450 gram of glucose is presentin 5oog of water. Express theConcentration of solute in mass%

What is observed when cuco3 is heated

Question 10:27. The bonding ofthe activated complex ischaracteristic of a reactants only.c. both reactants and products. b.products only. d. solids only.Choose correct option