52639 + Interview Questions in Secondary School in Chemistry

1.	Write the product obtained in the following reaction please answer
Answer» first is NAOH h2co3 is the second NEUTRAL is the third h2s03 is the FOURTH i HOPE you and MARK as a brain list

1.

Write the product obtained in the following reaction please answer

Answer»

first is NAOH

h2co3 is the second

NEUTRAL is the third

h2s03 is the FOURTH

i HOPE you and MARK as a brain list

Discussion

2.	Burning of natural gas is exothermic or endothermic
Answer» heyy MATE ...!!! BURNING gas releases HEAT and warms whatever is around it, so it's *exothermic*. An endothermic process absorbs heat and cools the surrounding area. A melting block of ICE cools the area around it as it absorbs heat to melt, so it's endothermic.

2.

Burning of natural gas is exothermic or endothermic

Answer»

heyy MATE ...!!!

BURNING gas releases HEAT and warms whatever is around it, so it's exothermic. An endothermic process absorbs heat and cools the surrounding area. A melting block of ICE cools the area around it as it absorbs heat to melt, so it's endothermic.

Discussion

3.	What are the characteristic test of carbon dioxide?
Answer» Carbon DIOXIDE is a colourless and odourless gas. It turns LIME WATER milky without affecting POTASSIUM DICHROMATE solution. It turns red litmus blue. Hope It Helps!!!

3.

What are the characteristic test of carbon dioxide?

Answer»

Carbon DIOXIDE is a colourless and odourless gas. It turns LIME WATER milky without affecting POTASSIUM DICHROMATE solution. It turns red litmus blue.

Hope It Helps!!!

Discussion

4.	Translate my conscience told me that i should help other
Answer» Translation in hindi :- मेरी अंतरात्मा ने कहा की मुझे उसकी मदद करनी चहिए l HOPE IT HELPS ! PLS MARK BRAINLIEST ! DON'T FORGET TO FOLLOW ! ✨☺✨

4.

Translate my conscience told me that i should help other

Answer»

Translation in hindi :-

मेरी अंतरात्मा ने कहा की मुझे उसकी मदद करनी चहिए l

HOPE IT HELPS !

PLS MARK BRAINLIEST !

DON'T FORGET TO FOLLOW !

✨☺✨

Discussion

5.	28.The number of water molecules present in adrop of water (volume 0.0018 ml) at room tem-perature is(1) 6.023 x 1019 (2) 1.084 x 1078(3) 4.84 x 1017 (4) 19.7 kg of gold
Answer» Your CORRECT ANSWER is 3

Discussion

6.	Which of the following is more compresiblle? CO2,H2O,Nacl?
Answer» ANSWER: The answer is CO2 Explanation: BECAUSE THE OTHER ONE H2O IS A LIQUID AND NaCl IS A SOLID

6.

Which of the following is more compresiblle? CO2,H2O,Nacl?

Answer»

ANSWER:

The answer is CO2

Explanation:

BECAUSE THE OTHER ONE H2O IS A LIQUID AND NaCl IS A SOLID

Discussion

7.	Find the total number of molecules , atom and electron in 45 gm of uria
Answer» ANSWER: SORRY EXPLANATION: sorry BRO I am not STUDY about it

7.

Find the total number of molecules , atom and electron in 45 gm of uria

Answer»

ANSWER:

SORRY

EXPLANATION:

sorry BRO I am not STUDY about it

Discussion

8.	Give reason:Solid do not take the shape of the container but sugar and salt do so
Answer» Answer: SUGAR and salt when kept in DIFFERENT jars do not gain their shape or the shape of the sugar or salt crystals do not CHANGE at all. ... And that is why we say that almond doesn't gain the shape of container - because spaces are noticeable. MARK AS BRAINLIEST

8.

Give reason:Solid do not take the shape of the container but sugar and salt do so

Answer»

Answer:

SUGAR and salt when kept in DIFFERENT jars do not gain their shape or the shape of the sugar or salt crystals do not CHANGE at all. ... And that is why we say that almond doesn't gain the shape of container - because spaces are noticeable.

MARK AS BRAINLIEST

Discussion

9.	Coal product used in the manufacture of steel
Answer» Answer: Over 71% of the steel produced today uses coal. Metallurgical coal – or coking coal – is a VITAL ingredient in thesteel MAKING process. ... Steel is an alloy based PRIMARILY on iron. As iron occurs only as iron oxides in the earth's crust, the ORES MUST be converted, or 'reduced', using carbon.

9.

Coal product used in the manufacture of steel

Answer»

Answer:

Over 71% of the steel produced today uses coal. Metallurgical coal – or coking coal – is a VITAL ingredient in thesteel MAKING process. ... Steel is an alloy based PRIMARILY on iron. As iron occurs only as iron oxides in the earth's crust, the ORES MUST be converted, or 'reduced', using carbon.

Discussion

10.	An iron cupboard is solid at room temperature explain
Answer» it is because at ROOM temperature the physical nature of IRON is solid and since it has fixed shape and size and solid have TENDANCY to REGAIN its shape.Thats why it's solid at room temperature.

Discussion

11.	What information does the formula of CU (NO3 )2 give us?
Answer» It is the symbol of CALCIUM (II) NITRATE. It forms a BLUE CRYSTALLINE solid

11.

What information does the formula of CU (NO3 )2 give us?

Answer»

It is the symbol of CALCIUM (II) NITRATE. It forms a BLUE CRYSTALLINE solid

Discussion

12.	WHAT IS THE HYBRIDIZATION OF CARBON IN C2O42/
Answer» ANSWER: it's HYBRIDIZATION is *SP2*

12.

WHAT IS THE HYBRIDIZATION OF CARBON IN C2O42/

Answer»

ANSWER:

it's HYBRIDIZATION is SP2

Discussion

13.	Name the changes of state wax kept in sunshine
Answer» ANSWER:Decomposition reaction Explanation:when silver chloride in a China dish. PLACE this chain dish in sunlight for some TIME. Silver chloride TURNS GREY in sunlight.

13.

Name the changes of state wax kept in sunshine

Answer»

ANSWER:Decomposition reaction

Explanation:when silver chloride in a China dish. PLACE this chain dish in sunlight for some TIME. Silver chloride TURNS GREY in sunlight.

Discussion

14.	What are point and diffuse sources of water pollution?
Answer» Answer: By contrast, nonpoint SOURCE water pollution is caused by broadly distributed and disconnected SOURCES of pollution, such as RAIN and snowmelt runoff, spills, leaks, and sediment erosion. The Clean Water Act makes it unlawful to discharge any pollutant from a point source into NAVIGABLE waters without a PERMIT.

14.

What are point and diffuse sources of water pollution?

Answer»

Answer:

By contrast, nonpoint SOURCE water pollution is caused by broadly distributed and disconnected SOURCES of pollution, such as RAIN and snowmelt runoff, spills, leaks, and sediment erosion. The Clean Water Act makes it unlawful to discharge any pollutant from a point source into NAVIGABLE waters without a PERMIT.

Discussion

15.	The electrons with atomic number 17 35 53 85 are all
Answer» Answer: HALOGENS is the answer. ATOMIC NUMBER 17 is chlorine,35 is bromine,53 is LODINE and 85 is astatine. hope this helps you my frnd ✌️✌️✌️

15.

The electrons with atomic number 17 35 53 85 are all

Answer»

Answer:

HALOGENS is the answer. ATOMIC NUMBER 17 is chlorine,35 is bromine,53 is LODINE and 85 is astatine.

hope this helps you my frnd ✌️✌️✌️

Discussion

16.	5. A sample of a mixture of Na.CO, and NaHCO3is subjected to heating till there is no further lossin weight. Assuming that the loss in weight of thesample is 22% of the initial weight of the mixturedue to the evolution of CO, find out the relativepercentages of the two components in the mixture.
Answer» ANSWER: hahhahahahahahahhaa

16.

5. A sample of a mixture of Na.CO, and NaHCO3is subjected to heating till there is no further lossin weight. Assuming that the loss in weight of thesample is 22% of the initial weight of the mixturedue to the evolution of CO, find out the relativepercentages of the two components in the mixture.

Answer»

ANSWER:

hahhahahahahahahhaa

Discussion

17.	the electronic configuration of an atom is K^2 L^7.if there are 10 neutrons in the atom,its mass number is options are 28,19,10 and 9
Answer» No. of ELECTRONS in 'K' shell = 2 No. of electrons in 'L' shell = 7 THEREFORE, ATOMIC NUMBER = TOTAL NUMBER OF ELECTRONS = 2 + 7 = 9 No. of Neutrons = Mass Number - Atomic Number 10 = Mass number - 9 Mass number = 10 + 9 = 19 Correct option is (B). HOPE IT HELPS!!!!

17.

the electronic configuration of an atom is K^2 L^7.if there are 10 neutrons in the atom,its mass number is options are 28,19,10 and 9

Answer»

No. of ELECTRONS in 'K' shell = 2

No. of electrons in 'L' shell = 7

THEREFORE, ATOMIC NUMBER = TOTAL NUMBER OF ELECTRONS

= 2 + 7 = 9

No. of Neutrons = Mass Number - Atomic Number

10 = Mass number - 9

Mass number = 10 + 9 = 19

Correct option is (B).

HOPE IT HELPS!!!!

Discussion

18.	Can oxidation reaction occur without the involvement of oxygen ? give example.
Answer» Answer: Yes it occurs when in a reaction non METALLIC substance is ADDED and metallic substance is reduced ..plz mark me brainliest.Cd+ 2HCl--- CdCl2 + H2

18.

Can oxidation reaction occur without the involvement of oxygen ? give example.

Answer»

Answer:

Yes it occurs when in a reaction non METALLIC substance is ADDED and metallic substance is reduced ..plz mark me brainliest.Cd+ 2HCl--- CdCl2 + H2

Discussion

19.	scientist can break atoms to get still smaller particles.in the light of what you have read in this chapter, do you think that a broken atom of say gold,will have the same properties as an atom of gold?
Answer» no it is not TRUE it will not have

19.

scientist can break atoms to get still smaller particles.in the light of what you have read in this chapter, do you think that a broken atom of say gold,will have the same properties as an atom of gold?

Answer»

no it is not TRUE it will not have

Discussion

20.	TMO dit isz mol I list's-1PCMCHEMIstry46. The units of rate constant and rate of reactionare identical for1) Zero order reaction2) First order reaction3) Second order reaction4) Pseudo-first order reaction
Answer» Zero order REACTION are the RATE of constant and reaction UNITS

Discussion

21.	What is friedal craft alkylation reaction ?
Answer» The Friedel–Crafts reactions are a set of reactions developed by Charles Friedel and JAMES Crafts in 1877 to ATTACH substituents to an aromatic ring.[1] Friedel–Crafts reactions are of two MAIN TYPES: alkylation reactions and acylation reactions. Both proceed by electrophilic aromatic substitution.[

Discussion

22.	Whicli gas is usually liberated when an acid reacts with a metalIllustrate with an example How will you test for the presence ofthis gas
Answer» ANSWER: Hydrogen Explanation: fycihjcgkbonlnknononcyxf. yhbvn. gkhfvhn. ufug. vukvn

22.

Whicli gas is usually liberated when an acid reacts with a metalIllustrate with an example How will you test for the presence ofthis gas

Answer»

ANSWER:

Hydrogen

Explanation:

fycihjcgkbonlnknononcyxf. yhbvn. gkhfvhn. ufug. vukvn

Discussion

23.	SzMallit J32 mol netelPCCHEM46. The units of rate constant and rate of reactionare identical for1) Zero order reaction2) First order reaction3) Second order reaction4) Pseudo-first order reaction
Answer» ANSWER: There is a CAPITAL issue and I have will be back in to ORDER for this MONTH but

23.

SzMallit J32 mol netelPCCHEM46. The units of rate constant and rate of reactionare identical for1) Zero order reaction2) First order reaction3) Second order reaction4) Pseudo-first order reaction

Answer»

ANSWER:

There is a CAPITAL issue and I have will be back in to ORDER for this MONTH but

Discussion

24.	5.Correct the error in each of the following statements:(a) The formula of ammonia is NH,(b) Molecules of potassium chloride have the formula KCI.(c) cr is a cation(d) CH, is a polyatomic ion.e anders are in ach of the followin
Answer» EXPLANATION: NH4 it is an anion it is MONOATOMIC

24.

5.Correct the error in each of the following statements:(a) The formula of ammonia is NH,(b) Molecules of potassium chloride have the formula KCI.(c) cr is a cation(d) CH, is a polyatomic ion.e anders are in ach of the followin

Answer»

EXPLANATION:

NH4

it is an anion

it is MONOATOMIC

Discussion

25.	How can we reduce the environmental pollution caused by synthetic materials/ fibres??
Answer» Answer: Explanation: .Our environment is slowly moving towards degeneration due to excessive use of synthetic MATERIALS and fibres. .It is mostly exhibited in the use of polethynes and plastic bags. .We can always FIND people littering on the streets. .Wrappers and other such waster papers often clog the DRAINAGE system thereby creating a lot of TROUBLES for commuters and harming the environment. .Therefore, we should take bold steps to avoid such problems. .We should avoid using synthetic materials and use green bags that are eco-friendly in nature

25.

How can we reduce the environmental pollution caused by synthetic materials/ fibres??

Answer»

Answer:

Explanation:

.Our environment is slowly moving towards degeneration due to excessive use of synthetic MATERIALS and fibres.

.It is mostly exhibited in the use of polethynes and plastic bags.

.We can always FIND people littering on the streets.

.Wrappers and other such waster papers often clog the DRAINAGE system thereby creating a lot of TROUBLES for commuters and harming the environment.

.Therefore, we should take bold steps to avoid such problems.

.We should avoid using synthetic materials and use green bags that are eco-friendly in nature

Discussion

26.	Explain briefly interconversion of state of matter on the basis of kinetic theory of gas
Answer» Answer: We know that when heat is SUPPLIED to anything its kinetic energy increases... so keeping this concept in mind when something in solid state is heated the kinetic energy possessed by the molecules increase and they start vibrating and after some TIME they break apart and convert into liquid form... same happens when a liquid is heated... the molecules gain ENOUGH kinetic energy and LEAVE the surface of the liquid becoming a GAS

26.

Explain briefly interconversion of state of matter on the basis of kinetic theory of gas

Answer»

Answer:

We know that when heat is SUPPLIED to anything its kinetic energy increases... so keeping this concept in mind when something in solid state is heated the kinetic energy possessed by the molecules increase and they start vibrating and after some TIME they break apart and convert into liquid form...

same happens when a liquid is heated... the molecules gain ENOUGH kinetic energy and LEAVE the surface of the liquid becoming a GAS

Discussion

27.	Why balloon is blast in sunlight?
Answer» $\huge\mathcal\purple{Heya..Mate!!}$ $\huge\bold\pink{ANSWER:}$ ⏩The kinetic energy of gases INCREASES with the increase in the temperatures.When a balloon is kept in the sun, due to Sun's HEAT, the kinetic energy of gaseous particles INSIDE the balloon also gets increased and the balloon expands and then comes a stage when the balloon finally blasts.... ✔✔✔✔✔ Hope it helps...:-) ✨❤⭐♥✨❤⭐♥✨ Be BRAINLY...✌✌✌

27.

Why balloon is blast in sunlight?

Answer»

$\huge\mathcal\purple{Heya..Mate!!}$

$\huge\bold\pink{ANSWER:}$

⏩The kinetic energy of gases INCREASES with the increase in the temperatures.When a balloon is kept in the sun, due to Sun's HEAT, the kinetic energy of gaseous particles INSIDE the balloon also gets increased and the balloon expands and then comes a stage when the balloon finally blasts....

✔✔✔✔✔

Hope it helps...:-)

✨❤⭐♥✨❤⭐♥✨

Be BRAINLY...✌✌✌

Discussion

28.	How to calculate equivalent mass of MgCO3
Answer» Answer: Molar mass of MgCO3 is 84.3139 g Explanation: Equivalent mass of MgCO3 = Molar mass of MgCO3/charge present on IONIC FORM M.m of MgCO3 i.e magnesium CARBONATE MgCO3 = 24+12+3(16)=84.3139 g/mole ....I hope it MAY help u

28.

How to calculate equivalent mass of MgCO3

Answer»

Answer:

Molar mass of MgCO3 is 84.3139 g

Explanation:

Equivalent mass of MgCO3 = Molar mass of MgCO3/charge present on IONIC FORM M.m of MgCO3 i.e magnesium CARBONATE

MgCO3 = 24+12+3(16)=84.3139 g/mole

....I hope it MAY help u

Discussion

29.	Vapour pressure when non volatile substance is added
Answer» The vapor PRESSURE of a SOLVENT is lowered by the ADDITION of a non-volatile solute to form a solution. By definition, a non-volatile substancedoes not EVAPORATE.

Discussion

30.	Why should curd and sour substances not be kept in brass and coppervesselsWhirli11 libertad
Answer» EXPLANATION: *Because* *they* *react* *with* *them; CURD* *and* *sour* *SUBSTANCES* *react* *with* *IMPURITIES* *stick* on *BRASS* *and* *copper*

30.

Why should curd and sour substances not be kept in brass and coppervesselsWhirli11 libertad

Answer»

EXPLANATION:

Because they react with them;

CURD and sour SUBSTANCES react with IMPURITIES stick on BRASS and copper

Discussion

31.	Give one example of Oxidation reaction in which do not involve oxygen
Answer» if hydrogen gas is passed over the heated METAL of COPPER oxide, the black coating on its SURFACE turns BROWN as the reverse action takes place and copper is obtained CuO + H2 ----> CU + H20 (heat)

31.

Give one example of Oxidation reaction in which do not involve oxygen

Answer»

if hydrogen gas is passed over the heated METAL of COPPER oxide, the black coating on its SURFACE turns BROWN as the reverse action takes place and copper is obtained

CuO + H2 ----> CU + H20

(heat)

Discussion

32.	Cowdung is a physical or chemical change . give reasons.
Answer» ANSWER: is it COW DUNG ORE BURNING of cow dung

32.

Cowdung is a physical or chemical change . give reasons.

Answer»

ANSWER:

is it COW DUNG ORE BURNING of cow dung

Discussion

33.	Hi guys ❤❤❤❤cute and sweet❤❤❣ YASHNA AS YOU CAN SEE❣.❤❤❤WHAT IS THE VALUE OF ABSOLUTE ZERO.➡️❎NO SPAMS.
Answer» ANSWER: here U go....... Explanation: Absolute zero is the lowest limit of the THERMODYNAMIC temperature SCALE, a state at which the ENTHALPY and entropy of a cooled ideal gas reach their minimum value, taken as 0. absolute zero = 0 Kelvin = -273 K hope this helps u...... mark me as *BRAINLIEST...... FOLLOW*** ME.....

33.

Hi guys ❤❤❤❤cute and sweet❤❤❣ YASHNA AS YOU CAN SEE❣.❤❤❤WHAT IS THE VALUE OF ABSOLUTE ZERO.➡️❎NO SPAMS.

Answer»

ANSWER:

here U go.......

Explanation:

Absolute zero is the lowest limit of the THERMODYNAMIC temperature SCALE, a state at which the ENTHALPY and entropy of a cooled ideal gas reach their minimum value, taken as 0.

absolute zero = 0 Kelvin = -273 K

hope this helps u......

mark me as BRAINLIEST......

FOLLOW ME.....

Discussion

34.	Structural difference between thermoplastic and thermosetting polymers
Answer» A.thermoplastic - 1.the polymer where shape can be changed application of heat and pressure are known as thermoplastics 2.thermoplastic have weale force of interaction among the chains 3. linear or BRANCH polymers in which chains of MOLECULES are not interconnected with each other b.thermosetting - 1.polymers that are heavily cross linked to produce a strong three dimensional network STRUCTURE . 2.the whole mass of the polymer is well connected with co-value BONDS

Discussion

35.	Velocity of electron in first orbit of hydrogen atom
Answer» The velocity of electron in the first Bohr orbit of hydrogen atom is, Explanation : Formula used for velocity of electrons in Bohr orbit of hydrogen atom is : where, V = velocity of electron = ? n = principle quantum NUMBER = 1 h = Planck's constant = m = mass of electron = r = Bohr radius = Conversion used : Now put all the given values in the above formula, we GET : Therefore, the velocity of electron in the first Bohr orbit of hydrogen atom is, READ more on Brainly.in - brainly.in/question/3829236#readmore

35.

Velocity of electron in first orbit of hydrogen atom

Answer»

The velocity of electron in the first Bohr orbit of hydrogen atom is,

Explanation :

Formula used for velocity of electrons in Bohr orbit of hydrogen atom is :

where,

V = velocity of electron = ?

n = principle quantum NUMBER = 1

h = Planck's constant =

m = mass of electron =

r = Bohr radius =

Conversion used :

Now put all the given values in the above formula, we GET :

Therefore, the velocity of electron in the first Bohr orbit of hydrogen atom is,

READ more on Brainly.in - brainly.in/question/3829236#readmore

Discussion

36.	Various type of steri strain and their effect on reactivity
Answer» Explanation: Steric strain is the INCREASE in POTENTIAL ENERGY of a molecule due to repulsion between electrons in atoms that are not directly bonded to each other. eg: Consider two staggered conformations of 1,2-dibromoethane: In 1, the bromine atoms are closer to each other than they are in 2.

36.

Various type of steri strain and their effect on reactivity

Answer»

Explanation:

Steric strain is the INCREASE in POTENTIAL ENERGY of a molecule due to repulsion between electrons in atoms that are not directly bonded to each other. eg: Consider two staggered conformations of 1,2-dibromoethane: In 1, the bromine atoms are closer to each other than they are in 2.

Discussion

37.	.24 2.0 g of a mixture of Na, Co, and NaHCO, was heated when its weightreduced to 1.876 g. Determine the percentage composition of the mixture.
Answer» ANSWER: GSG shy gt BBC has it WEB F

37.

.24 2.0 g of a mixture of Na, Co, and NaHCO, was heated when its weightreduced to 1.876 g. Determine the percentage composition of the mixture.

Answer»

ANSWER:

GSG shy gt BBC has it WEB F

Discussion

38.	What is plasma state
Answer» Answer: Plasma (from Ancient Greek πλάσμα, meaning 'moldable substance'[1]) is one of the four fundamental states of MATTER, and was first DESCRIBED by chemist Irving Langmuir[2] in the 1920s.[3] It consists of a gas of ions – atoms which have some of their orbital electrons removed – and free electrons. Plasma can be artificially generated by heating a NEUTRAL gas or subjecting it to a strong electromagnetic field to the point where an ionized gaseous substance becomes increasingly electrically conductive. The resulting charged ions and electrons become influenced by long-range electromagnetic fields, making the plasma dynamics more sensitive to these fields than a neutral gas.[4] Explanation: Plasma and ionized gases have properties and display behaviours unlike those of the other states, and the transition between them is mostly a matter of nomenclature[2] and SUBJECT to interpretation.[5] Based on the temperature and density of the environment that contains a plasma, partially ionized or fully ionized forms of plasma may be produced. Neon signs and lightning are examples of partially ionized plasmas.[6] The Earth's ionosphere is a plasma and the magnetosphere contains plasma in the Earth's surrounding space environment. The interior of the Sun is an example of fully ionized plasma,[7] along with the solar corona[8] and stars.[9] please *follow* me and mark me as brainliest hope helpful for you**.

38.

What is plasma state

Answer»

Answer:

Plasma (from Ancient Greek πλάσμα, meaning 'moldable substance'[1]) is one of the four fundamental states of MATTER, and was first DESCRIBED by chemist Irving Langmuir[2] in the 1920s.[3] It consists of a gas of ions – atoms which have some of their orbital electrons removed – and free electrons. Plasma can be artificially generated by heating a NEUTRAL gas or subjecting it to a strong electromagnetic field to the point where an ionized gaseous substance becomes increasingly electrically conductive. The resulting charged ions and electrons become influenced by long-range electromagnetic fields, making the plasma dynamics more sensitive to these fields than a neutral gas.[4]

Explanation:

Plasma and ionized gases have properties and display behaviours unlike those of the other states, and the transition between them is mostly a matter of nomenclature[2] and SUBJECT to interpretation.[5] Based on the temperature and density of the environment that contains a plasma, partially ionized or fully ionized forms of plasma may be produced. Neon signs and lightning are examples of partially ionized plasmas.[6] The Earth's ionosphere is a plasma and the magnetosphere contains plasma in the Earth's surrounding space environment. The interior of the Sun is an example of fully ionized plasma,[7] along with the solar corona[8] and stars.[9]

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hope helpful for you.

Discussion

39.	6. Mention three characteristics of a mixture.
Answer» Answer: canbe separated easily WITHOUT any chemical method. chemical and physical properties of COMPONENTS remain the same. two TYPES ie homogeneous and HETEROGENEOUS types. can be solid mixture, liquid or gas.

39.

6. Mention three characteristics of a mixture.

Answer»

Answer:

canbe separated easily WITHOUT any chemical method.

chemical and physical properties of COMPONENTS remain the same.

two TYPES ie homogeneous and HETEROGENEOUS types.

can be solid mixture, liquid or gas.

Discussion

40.	What is decomposition reaction????
Answer» DECOMPOSITION REACTION The reaction in which a single compound DECOMPOSES into two or more compounds is CALLED as DECOMPOSITION REACTION

40.

What is decomposition reaction????

Answer»

DECOMPOSITION REACTION

The reaction in which a single compound DECOMPOSES into two or more compounds is CALLED as DECOMPOSITION REACTION

Discussion

41.	Write the formula of the following compounds:1 Potassium- a chloride b nitrate c carbonate d bisulphate e sulphite f dicromate g permangnate h zincate i plumbite j sulphate k bicarbonate l alumite m hydroxide n iodode o nitrite p bisulphate 2 Sodium- a chloride b nitrate c carbonate d bisulphate e sulphite f dicromate g permangnate h zincate i plumbite j sulphate k bicarbonate l alumite m hydroxide n iodode o nitrite p bisulphate 3 Calsium- a chloride b nitrate c carbonate d bisulphate e sulphite f sulphate g bicarbonate h bisulphate 4 Magnesium- a chloride b nitrate c carbonate d sulphate e bicarbonate f hydroxide g oxide
Answer» I just SENT the (i)...i have no TIME.. ........ HOPE it HELPS........

41.

Write the formula of the following compounds:1 Potassium- a chloride b nitrate c carbonate d bisulphate e sulphite f dicromate g permangnate h zincate i plumbite j sulphate k bicarbonate l alumite m hydroxide n iodode o nitrite p bisulphate 2 Sodium- a chloride b nitrate c carbonate d bisulphate e sulphite f dicromate g permangnate h zincate i plumbite j sulphate k bicarbonate l alumite m hydroxide n iodode o nitrite p bisulphate 3 Calsium- a chloride b nitrate c carbonate d bisulphate e sulphite f sulphate g bicarbonate h bisulphate 4 Magnesium- a chloride b nitrate c carbonate d sulphate e bicarbonate f hydroxide g oxide

Answer»

I just SENT the (i)...i have no TIME..

........ HOPE it HELPS........

Discussion

42.	The total number of electrons in 2 grams of hydrogen is
Answer» $\mathfrak{\large{\underline{\underline{Given:-}}}}$ Mass of HYDROGEN = 2g Gram atomic mass of hydrogen= 1g $\mathfrak{\large{\underline{\underline{Answer:-}}}}$ Since, 1 g of hydrogen has $\bold{6.022 \times {10}^{23} atoms}$ No. of atoms in 2 g of hydrogen = $\bold{2 × 6.022 \times {10}^{23} }$ $\implies$ $\bold{12.044 \times {10}^{23} }$ atoms of hydrogen. 1 atom of hydrogen CONTAIN = 1 ELECTRON. No. of electron in $\bold{12.044 \times {10}^{23} }$ atoms. No. of electrons in 2g of hydrogen $\bold{= 12 \times {10}^{23} }$ electrons.

42.

The total number of electrons in 2 grams of hydrogen is

Answer»

$\mathfrak{\large{\underline{\underline{Given:-}}}}$

Mass of HYDROGEN = 2g

Gram atomic mass of hydrogen= 1g

$\mathfrak{\large{\underline{\underline{Answer:-}}}}$

Since, 1 g of hydrogen has $\bold{6.022 \times {10}^{23} atoms}$

No. of atoms in 2 g of hydrogen = $\bold{2 × 6.022 \times {10}^{23} }$

$\implies$ $\bold{12.044 \times {10}^{23} }$ atoms of hydrogen.

1 atom of hydrogen CONTAIN = 1 ELECTRON.

No. of electron in $\bold{12.044 \times {10}^{23} }$ atoms.

No. of electrons in 2g of hydrogen $\bold{= 12 \times {10}^{23} }$ electrons.

Discussion

43.	Structure of the compound p-nitropenoxide ion
Answer» ANSWER: REFER the ATTACHMENT PLEASE..,

43.

Structure of the compound p-nitropenoxide ion

Answer»

ANSWER:

REFER the ATTACHMENT PLEASE..,

Discussion

44.	The term pvc used in the plastic industry stands for
Answer» Answer: The term PVC used in the plastic industry STANDS for POLYVINYL CHLORIDE.

44.

The term pvc used in the plastic industry stands for

Answer»

Answer:

The term PVC used in the plastic industry STANDS for POLYVINYL CHLORIDE.

Discussion

45.	Give reasons why the two isotopes of magnesium have different mass numbers?
Answer» ANSWER: because the isotopes has founddeferent CATEGORIES. so........ EXPLANATION: i THIK u FOUND his questions answer

45.

Give reasons why the two isotopes of magnesium have different mass numbers?

Answer»

ANSWER:

because the isotopes has founddeferent CATEGORIES. so........

EXPLANATION:

i THIK u FOUND his questions answer

Discussion

46.	What is the difference between an atom and a molecule? given an example of each
Answer» Answer: In a MOLECULE, atoms are bonded together by single, double, or triple BONDS. An ATOM has a nucleus surrounded by electrons. ... So another difference between atoms and MOLECULES is that when similar atoms COMBINE together in varying numbers, molecules of different properties can be formed.

46.

What is the difference between an atom and a molecule? given an example of each

Answer»

Answer:

In a MOLECULE, atoms are bonded together by single, double, or triple BONDS. An ATOM has a nucleus surrounded by electrons. ... So another difference between atoms and MOLECULES is that when similar atoms COMBINE together in varying numbers, molecules of different properties can be formed.

Discussion

47.	What is claude's appatatus?
Answer» Liquefaction of GASES is physical CONVERSION of a gas into a LIQUID STATE (CONDENSATION).

47.

What is claude's appatatus?

Answer»

Liquefaction of GASES is physical CONVERSION of a gas into a LIQUID STATE (CONDENSATION).

Discussion

48.	Which of the following are possible values of N L and M for an atom having maximum value of m=+2
Answer» Answer: The possible value of n will be 3, l will be 0, 1, 2 and m will be -2, -1, 0, +1, +2. Explanation: 1. PRINCIPLE Quantum Numbers: This quantum number DESCRIBES the size of the orbital. It is represented by n. n = 1,2,3,4.... 2. Azimuthal Quantum Number: This quantum number describes the shape of the orbital. It is represented as 'l'. The value of l RANGES from 0 to (n-1). For l = 0,1,2,3... the orbitals are s, p, d, f... 3. Magnetic Quantum Number: This quantum number describes the orientation of the orbitals. It is represented as $m_l$ . The value of this quantum number ranges from $(-l\text{ to }+l)$ . When l = 2, the value of $m_l$ will be -2, -1, 0, +1, +2. If maximum value of m is +2, the possible values will be m will be -2, -1, 0, +1, +2. and l = 2, 1 and 0, The possible value of n will be 3.

48.

Which of the following are possible values of N L and M for an atom having maximum value of m=+2

Answer»

Answer: The possible value of n will be 3, l will be 0, 1, 2 and m will be -2, -1, 0, +1, +2.

Explanation:

1. PRINCIPLE Quantum Numbers: This quantum number DESCRIBES the size of the orbital. It is represented by n. n = 1,2,3,4....

2. Azimuthal Quantum Number: This quantum number describes the shape of the orbital. It is represented as 'l'. The value of l RANGES from 0 to (n-1). For l = 0,1,2,3... the orbitals are s, p, d, f...

3. Magnetic Quantum Number: This quantum number describes the orientation of the orbitals. It is represented as $m_l$ . The value of this quantum number ranges from $(-l\text{ to }+l)$ . When l = 2, the value of $m_l$ will be -2, -1, 0, +1, +2.

If maximum value of m is +2, the possible values will be m will be -2, -1, 0, +1, +2. and l = 2, 1 and 0, The possible value of n will be 3.

Discussion

49.	20. Balance the following equations.a) BaCl2 + H2SO4 → BaSO4 + HCIc) HNO3 + Ca (OH)2-->Ca(NO3)2 + H2Oe) NH3 + CuO -->Cu+N2 + H2Og) Mg(OH)2 + HCl → MgCl2 + H2Ob) NaOH + H2SO4 → Na2SO4 + H2Od) Al2(SO4)3 + NaOH → Al(OH)3 + Na2SO4f) Fe + 02 - Fe2○3h) H2○2-H2○+○2I Hope You Don't Have Confussion With The QuestionAnswer It By Serial Wise Please!
Answer» ANSWER: CA(OH)2 + 2HNO3 → Ca(NO3)2 + 2H2O

49.

20. Balance the following equations.a) BaCl2 + H2SO4 → BaSO4 + HCIc) HNO3 + Ca (OH)2-->Ca(NO3)2 + H2Oe) NH3 + CuO -->Cu+N2 + H2Og) Mg(OH)2 + HCl → MgCl2 + H2Ob) NaOH + H2SO4 → Na2SO4 + H2Od) Al2(SO4)3 + NaOH → Al(OH)3 + Na2SO4f) Fe + 02 - Fe2○3h) H2○2-H2○+○2I Hope You Don't Have Confussion With The QuestionAnswer It By Serial Wise Please!

Answer»

ANSWER:

CA(OH)2 + 2HNO3 → Ca(NO3)2 + 2H2O

Discussion

50.	copper vessel when left in moist air turns green due to formation of options are cucl2,cuco3,cuso4,cu(oh)2 and cuo
Answer» Cu(OH2) is FORMED when copper is left in AIR( which is bluish GREEN COLOUR) (please follow and THANKS the answer:-). )

50.

copper vessel when left in moist air turns green due to formation of options are cucl2,cuco3,cuso4,cu(oh)2 and cuo

Answer»

Cu(OH2) is FORMED when copper is left in AIR( which is bluish GREEN COLOUR)

(please follow and THANKS the answer:-). )

Discussion

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