52639 + Interview Questions in Secondary School in Chemistry

1.	The difference between the electrode potentials of two electrodes when no current is drawn through the cell is called
Answer» ANSWER: POTENTIAL difference Brainleist PLEASE

1.

The difference between the electrode potentials of two electrodes when no current is drawn through the cell is called

Answer»

ANSWER:

POTENTIAL difference

Brainleist PLEASE

Discussion

2.	Identify the error plzzz answer it's urgent
Answer» ANSWER: (a) outermost (b) not evolved (c) CALCIUM oxide (d) reducing AGENT (e) INSOLUBLE

2.

Identify the error plzzz answer it's urgent

Answer»

ANSWER:

(a) outermost

(b) not evolved

(c) CALCIUM oxide

(d) reducing AGENT

(e) INSOLUBLE

Discussion

3.	Out of Li, Be, Mg, Al, P and Cl which have completely filled and half-filled orbitals consequentlylarge ionisation enthalpie
Answer» ANSWER: li,al,p,cl these have HALF FILLED orbitals be,mg these have fully filled orbitals

3.

Out of Li, Be, Mg, Al, P and Cl which have completely filled and half-filled orbitals consequentlylarge ionisation enthalpie

Answer»

ANSWER:

li,al,p,cl these have HALF FILLED orbitals

be,mg these have fully filled orbitals

Discussion

4.	The difference between the electrode potentials of two electrodeswhen no current is drawn through the cell is called
Answer» Explanation: $\red{ \underline \red{ \over{ \mid \green{{\huge \frak{QuésTion:-}}} \mid}}}$ ★ Find the perimeter of a rectangle if its length is 15m and one of the diagonals is 17 m Cuba Norway South Korea the United States $\red{ \underline \red{ \over{ \mid \green{{\huge \frak{₳ηsωεя:-}}} \mid}}}$ South Korea The two major disadvantages of WIND POWER include initial cost and technology IMMATURITY. Firstly, constructing turbines and wind facilities is EXTREMELY expensive. The second disadvantage is technology immaturity.

4.

The difference between the electrode potentials of two electrodeswhen no current is drawn through the cell is called

Answer»

Explanation:

$\red{ \underline \red{ \over{ \mid \green{{\huge \frak{QuésTion:-}}} \mid}}}$

★ Find the perimeter of a rectangle if its length is 15m and one of the

diagonals is 17 m

Cuba

Norway

South Korea

the United States

$\red{ \underline \red{ \over{ \mid \green{{\huge \frak{₳ηsωεя:-}}} \mid}}}$

South Korea

The two major disadvantages of WIND POWER include initial cost and technology IMMATURITY. Firstly, constructing turbines and wind facilities is EXTREMELY expensive.

The second disadvantage is technology immaturity.

Discussion

5.	Give the answer fast and correct
Answer» ANSWER: HELLO GOOD MORNING how are you

5.

Give the answer fast and correct

Answer»

ANSWER:

HELLO GOOD MORNING how are you

Discussion

6.	Calculation of Density of an Ideal Gassertion he salonlar
Answer» Answer: What is the density of a gas with molar mass 100 g/mol at 0.5 atm and 27 degrees Celsius?for example Explanation: Before you begin, keep in mind what you're looking for as an answer in terms of units. Density is defined as mass per unit volume, which can be expressed in terms of grams per liter or grams per milliliter. You may need to do unit CONVERSIONS. Keep on the lookout for unit mismatches when you plug values into equations. First, start with the ideal gas law: PV = nRT where P = pressure, V = volume, n = NUMBER of moles of gas, R = gas constant = 0.0821 L·atm/mol·K, and T = absolute temperature (in KELVIN) Examine the units of R carefully. This is where many people get into TROUBLE. You'll get an incorrect answer if you enter a temperature in Celsius or pressure in Pascals, etc. Always use atmosphere for pressure, liters for volume, and Kelvin for temperature. To find the density of the gas, you need to know the mass of the gas and the volume. First, find the volume. Here is the ideal gas law equation rearranged to solve for V: V = nRT/P After you have found the volume, you must find the mass. The number of moles is the PLACE to start. The number of moles is the mass (m) of the gas divided by its molecular mass (MM): n = m/MM Substitute this mass value into the volume equation in place of n: V = mRT/MM·P Density (ρ) is mass per volume. Divide both sides by m: V/m = RT/MM·P Then invert the equation: m/V = MM·P/RT ρ = MM·P/RT Now you have the ideal gas law rewritten in a form you can use with the information you were given. To find the density of the gas, just plug in the values of the known variables. Remember to use absolute temperature for T: 27 degrees Celsius + 273 = 300 Kelvin ρ = (100 g/mol)(0.5 atm)/(0.0821 L·atm/mol·K)(300 K) ρ = 2.03 g/L The density of the gas is 2.03 g/L at 0.5 atm and 27 degrees Celsius. plz plz plz plz plz mark me as brain list

6.

Calculation of Density of an Ideal Gassertion he salonlar

Answer»

Answer:

What is the density of a gas with molar mass 100 g/mol at 0.5 atm and 27 degrees Celsius?for example

Explanation:

Before you begin, keep in mind what you're looking for as an answer in terms of units. Density is defined as mass per unit volume, which can be expressed in terms of grams per liter or grams per milliliter. You may need to do unit CONVERSIONS. Keep on the lookout for unit mismatches when you plug values into equations.

First, start with the ideal gas law:

PV = nRT

where P = pressure, V = volume, n = NUMBER of moles of gas, R = gas constant = 0.0821 L·atm/mol·K, and T = absolute temperature (in KELVIN)

Examine the units of R carefully. This is where many people get into TROUBLE. You'll get an incorrect answer if you enter a temperature in Celsius or pressure in Pascals, etc. Always use atmosphere for pressure, liters for volume, and Kelvin for temperature.

To find the density of the gas, you need to know the mass of the gas and the volume. First, find the volume. Here is the ideal gas law equation rearranged to solve for V:

V = nRT/P

After you have found the volume, you must find the mass. The number of moles is the PLACE to start. The number of moles is the mass (m) of the gas divided by its molecular mass (MM):

n = m/MM

Substitute this mass value into the volume equation in place of n:

V = mRT/MM·P

Density (ρ) is mass per volume. Divide both sides by m:

V/m = RT/MM·P

Then invert the equation:

m/V = MM·P/RT

ρ = MM·P/RT

Now you have the ideal gas law rewritten in a form you can use with the information you were given. To find the density of the gas, just plug in the values of the known variables. Remember to use absolute temperature for T:

27 degrees Celsius + 273 = 300 Kelvin

ρ = (100 g/mol)(0.5 atm)/(0.0821 L·atm/mol·K)(300 K) ρ = 2.03 g/L

The density of the gas is 2.03 g/L at 0.5 atm and 27 degrees Celsius.

plz plz plz plz plz mark me as brain list

Discussion

7.	Vi)in Rutherford'sGold foil experiment most of rays returns back to its path showng thata)most of the atom is hollowb)atoms have dense nucleus at the centrechatom is sphericald)atom is neutral
Answer» I think b)atoms have DENSE nucleus at the CENTRE is correct answer. Hope it is HELPFUL

7.

Vi)in Rutherford'sGold foil experiment most of rays returns back to its path showng thata)most of the atom is hollowb)atoms have dense nucleus at the centrechatom is sphericald)atom is neutral

Answer»

I think b)atoms have DENSE nucleus at the CENTRE is correct answer.

Hope it is HELPFUL

Discussion

8.	Q.7 The Oxidation number of Mn in KMnO, is +7 True or False
Answer» Answer: True HOPE this HELPS u pls mark me as BRAINLIEST

8.

Q.7 The Oxidation number of Mn in KMnO, is +7 True or False

Answer»

Answer:

True

HOPE this HELPS u

pls mark me as BRAINLIEST

Discussion

9.	Write iupac name of the following compound...
Answer» ANSWER: PHENOL reacts with conc. HNO3 in presence of concentric H2SO4 to form 2,4,6-trinitrophenol. (ii) Phenol reacts with zinc dust to form benzene. I will HELP in this question but the compound is wrong

9.

Write iupac name of the following compound...

Answer»

ANSWER:

PHENOL reacts with conc. HNO3 in presence of concentric H2SO4 to form 2,4,6-trinitrophenol.

(ii) Phenol reacts with zinc dust to form benzene.

I will HELP in this question but the compound is wrong

Discussion

10.	Find b ch3coch3 in presence of oh minus equal b
Answer» ANSWER: CH3COOH+ NAOH ------> CH3COONA+ h²o

10.

Find b ch3coch3 in presence of oh minus equal b

Answer»

ANSWER:

CH3COOH+ NAOH ------> CH3COONA+ h²o

Discussion

11.	Find b ch3coch3 in presence of oh minus equal
Answer» Explanation: ANSWER When acetone REACTS with BARIUM hydroxide, aldol condensation of acetone OCCURS in presence of base Ba(OH) 2 . Mesityl oxide is formed FOLLOWED by dehydration by heating.

11.

Find b ch3coch3 in presence of oh minus equal

Answer»

Explanation:

ANSWER

When acetone REACTS with BARIUM hydroxide, aldol condensation of acetone OCCURS in presence of base Ba(OH) 2

. Mesityl oxide is formed FOLLOWED by dehydration by heating.

Discussion

12.	Write the electrode reaction for electrolysis of molten Magnesiumchloride and Calcium chloride.
Answer» Answer: Electrolysis cell for molten SODIUM CHLORIDE: A commercial electrolysis cell for the production of metallic sodium and chlorine gas from molten NACL. Liquid sodium floats to the top of the MELT above the CATHODE and is drained off into a storage tank. Chlorine gas bubbles out of the melt above the anode.

12.

Write the electrode reaction for electrolysis of molten Magnesiumchloride and Calcium chloride.

Answer»

Answer:

Electrolysis cell for molten SODIUM CHLORIDE: A commercial electrolysis cell for the production of metallic sodium and chlorine gas from molten NACL. Liquid sodium floats to the top of the MELT above the CATHODE and is drained off into a storage tank. Chlorine gas bubbles out of the melt above the anode.

Discussion

13.	Which of the following formula is used to calculate the distance
Answer» Answer: Learn how to find the DISTANCE between two POINTS by USING the distance formula, which is an application of the PYTHAGOREAN THEOREM. We can rewrite the Pythagorean theorem as d=√((x_2-x_1)²+(y_2-y_1)²) to find the distance between any two points.

13.

Which of the following formula is used to calculate the distance

Answer»

Answer:

Learn how to find the DISTANCE between two POINTS by USING the distance formula, which is an application of the PYTHAGOREAN THEOREM. We can rewrite the Pythagorean theorem as d=√((x_2-x_1)²+(y_2-y_1)²) to find the distance between any two points.

Discussion

14.	Q3 Which of the following has the smallest size?(a) Na(b) Na(c) Na(d)
Answer» ANSWER: I THINK your OPTION is wrong Explanation:

14.

Q3 Which of the following has the smallest size?(a) Na(b) Na(c) Na(d)

Answer»

ANSWER:

I THINK your OPTION is wrong

Explanation:

Discussion

15.	A reaction occurs spontaneously if.
Answer» *Decrease of FREE ENERGY during the PROCESS under constant temperature and pressure PROVIDES a MEASURE of its spontaneity.*

Discussion

16.	. 6 A Reaction occurs spontaneously if:(a) T∆S∆H and ∆H in +ve, ∆S is -ve (c) T∆S>∆H and both ∆H and T∆S are +ve (d) T∆S=∆H and both ∆H and T∆S are +ve
Answer» ANSWER: (B) is CORRECT. My MARK my answer as BRAINLIEST

16.

. 6 A Reaction occurs spontaneously if:(a) T∆S∆H and ∆H in +ve, ∆S is -ve (c) T∆S>∆H and both ∆H and T∆S are +ve (d) T∆S=∆H and both ∆H and T∆S are +ve

Answer»

ANSWER:

(B) is CORRECT. My MARK my answer as BRAINLIEST

Discussion

17.	Read the reaction and determine thevalency of iron.The diatomic molecule of hydrogen reactswith a molecule of iron oxide (FeO) anddisplaces the atom of iron to form a watermolecule (H,0).
Answer» Answer: Its 2 Explanation: See given :- H2 + FeO REACTS to DISPLACE IRON and form water( this statement has no work) So as we knew that valency of oxygen is 2 and here if we do cross exchange between Fe and O then Fe MUST also be with valency 2 to form FeO. becoz if Fe has valency 1 then the molecule must be Fe2O and is its valency is 3 it must Fe2O3 but here it is FeO so their valency must be equal to cancel eachother. (make a diagram to understand better) hope you may got it please mark it as brainliest plzzzz and LIKE it also please follow me thank you

17.

Read the reaction and determine thevalency of iron.The diatomic molecule of hydrogen reactswith a molecule of iron oxide (FeO) anddisplaces the atom of iron to form a watermolecule (H,0).

Answer»

Answer:

Its 2

Explanation:

See given :- H2 + FeO REACTS to DISPLACE IRON and form water( this statement has no work)

So as we knew that valency of oxygen is 2 and here if we do cross exchange between Fe and O then Fe MUST also be with valency 2 to form FeO. becoz if Fe has valency 1 then the molecule must be Fe2O and is its valency is 3 it must Fe2O3 but here it is FeO so their valency must be equal to cancel eachother. (make a diagram to understand better)

hope you may got it

please mark it as brainliest plzzzz and LIKE it also

please follow me

thank you

Discussion

18.	A Reaction occurs spontaneously if:(a) T∆S∆H and ∆H in +ve, ∆S is -ve (c) T∆S>∆H and both ∆H and T∆S are +ve (d) T∆S=∆H and both ∆H and T∆S are
Answer» Answer: (C) is CORRECT option Explanation: ∆G must be NEGATIVE for spontaneity.

18.

A Reaction occurs spontaneously if:(a) T∆S∆H and ∆H in +ve, ∆S is -ve (c) T∆S>∆H and both ∆H and T∆S are +ve (d) T∆S=∆H and both ∆H and T∆S are

Answer»

Answer:

(C) is CORRECT option

Explanation:

∆G must be NEGATIVE for spontaneity.

Discussion

19.	કર્નાટચક્રની કાર્યક્શતાળ એટલેશું.?
Answer» ANSWER: sry can't understand ur LANGUAGE can u WRITE in other language like ENGLISH.....

19.

કર્નાટચક્રની કાર્યક્શતાળ એટલેશું.?

Answer»

ANSWER:

sry can't understand ur LANGUAGE can u WRITE in other language like ENGLISH.....

Discussion

20.	Compressibility factor for a gas under critical is
Answer» For IDEAL gases, Z=−1 at all TEMPERATURE and PRESSURE. mark me as BRILLIANT ✌️✌️✌️✌️

20.

Compressibility factor for a gas under critical is

Answer»

For IDEAL gases, Z=−1 at all TEMPERATURE and PRESSURE.

mark me as BRILLIANT ✌️✌️✌️✌️

Discussion

21.	(CH3)3C+>C6H5CH2+>CH2+>CH2——CHCH2+>CH3CH2it is question?what is answer
Answer» Answer: More the +I effect, lesser is the stability of CARBANIONS. So, stability of carbanion ORDER is: 10>20>30. Benzyl carbanion is most stable because of resonance stablisation. Stability order is: 4>3>2>1 C6H5CH2− >CH3CH2−>(CH3)2CH−>(CH3)3C−

21.

(CH3)3C+>C6H5CH2+>CH2+>CH2——CHCH2+>CH3CH2it is question?what is answer

Answer»

Answer:

More the +I effect, lesser is the stability of CARBANIONS. So, stability of carbanion ORDER is: 10>20>30. Benzyl carbanion is most stable because of resonance stablisation.

Stability order is: 4>3>2>1

C6H5CH2− >CH3CH2−>(CH3)2CH−>(CH3)3C−

Discussion

22.	How do blind man identify whether the given substances iron a plastic
Answer» Answer: hyyy dear Explanation: . Asat very basic TECHNIQUE, place that substance near any IRON CHAIR or road . if it attracts, it's a MAGNET. you can also break the substance into twõ and check if it attracts each õther. thank you follow me insta:Cute_chori6422

22.

How do blind man identify whether the given substances iron a plastic

Answer»

Answer:

hyyy dear

Explanation:

. Asat very basic TECHNIQUE, place that

substance near any IRON CHAIR or road .

if it attracts, it's a MAGNET. you can also

break the substance into twõ and check

if it attracts each õther.

thank you

follow me

insta:Cute_chori6422

Discussion

23.	State the following:1. A gaseous reducing agent which is basic in nature.2. A metal which cannot be used for the preparation of hydrogen using dilute acids.3. A solution which absorbs the impurity H2S.4. A gas which can be removed by using KOH5. A metal below iron but above copper in the activity series of metals which has no reaction with water.
Answer» Answer: 1.A gaseous reducing AGENT which is basic in nature. ==> NH3 - Ammonia is basic in nature as it has a lone pair and also it can act as a reducing agent as nitrogen is the lowest oxidation state thus nitrogen can be oxidized thus reducing the other substance. Thus it acts as both a reducing agent as well as a base. 2. A METAL which cannot be used for the preparation of hydrogen using dilute acids. ==>Metals which LIE below hydrogen in the activity series i.e. CU, Ag, Au cannot displace hydrogen from dilute acids, because they are less reactive than hydrogen. 8.

23.

State the following:1. A gaseous reducing agent which is basic in nature.2. A metal which cannot be used for the preparation of hydrogen using dilute acids.3. A solution which absorbs the impurity H2S.4. A gas which can be removed by using KOH5. A metal below iron but above copper in the activity series of metals which has no reaction with water.

Answer»

Answer:

1.A gaseous reducing AGENT which is basic in nature.

==> NH3 - Ammonia is basic in nature as it has a lone pair and also it can act as a reducing agent as nitrogen is the lowest oxidation state thus nitrogen can be oxidized thus reducing the other substance. Thus it acts as both a reducing agent as well as a base.

2. A METAL which cannot be used for the preparation of hydrogen using dilute acids.

==>Metals which LIE below hydrogen in the activity series i.e. CU, Ag, Au cannot displace hydrogen from dilute acids, because they are less reactive than hydrogen. 8.

Discussion

24.	Match the column.AB.DetoxificationSuicide bagBacteriaAmoebaNucleusfood vacuoleSmooth endoplasmic reticulumNucleusChromatin material and nucleolusLysosomehe following
Answer» ANSWER: LYSOSOME sucidal bag Hope it HELPS you

24.

Match the column.AB.DetoxificationSuicide bagBacteriaAmoebaNucleusfood vacuoleSmooth endoplasmic reticulumNucleusChromatin material and nucleolusLysosomehe following

Answer»

ANSWER:

LYSOSOME sucidal bag

Hope it HELPS you

Discussion

25.	Which of the following are not ioniccompounds?O Potassium chloride.O Carbon tetra chloride.O Sodium chlorideO Magnesium oxide.
Answer» *Answer : Carbon tetrachloride is a COVALENT compound and dissolves in ether and alcohol like ORGANIC compounds. HYDROCHLORIC acid is the gas dissolved in WATER while hydrogen chloride is the gaseous compound which is covalent in nature by its molecular structure. NACL and KCl are ionic compounds which dissociate into its ions in the aqueous solution. ° Carbon Tetra Chloride. (CCL4)

25.

Which of the following are not ioniccompounds?O Potassium chloride.O Carbon tetra chloride.O Sodium chlorideO Magnesium oxide.

Answer»

*Answer :

Carbon tetrachloride is a COVALENT compound and dissolves in ether and alcohol like ORGANIC compounds. HYDROCHLORIC acid is the gas dissolved in WATER while hydrogen chloride is the gaseous compound which is covalent in nature by its molecular structure. NACL and KCl are ionic compounds which dissociate into its ions in the aqueous solution.

° Carbon Tetra Chloride. (CCL4)

Discussion

26.	What is independt media
Answer» Explanation: Independent media refers to any FORM of media, such as RADIO, television, newspapers or Internet-based publications, that is free of influence by government or corporate interests. The term has varied APPLICATIONS. Within the UNITED States and other developed countries

26.

What is independt media

Answer»

Explanation:

Independent media refers to any FORM of media, such as RADIO, television, newspapers or Internet-based publications, that is free of influence by government or corporate interests. The term has varied APPLICATIONS. Within the UNITED States and other developed countries

Discussion

27.	Write the resonating structure of so3
Answer» ANSWER: structure Explanation: OH my GOD I don't KNOW SORRY

27.

Write the resonating structure of so3

Answer»

ANSWER:

structure

Explanation:

OH my GOD I don't KNOW SORRY

Discussion

28.	A Reaction occurs spontaneously if:(a) T∆S∆H and ∆H in +ve, ∆S is -ve (c) T∆S>∆H and both ∆H and T∆S are +ve (d) T∆S=∆H and both ∆H and T∆S are +ve
Answer» ANSWER: c Explanation: T◇shsh both ALSO the GOOD are +ve

28.

A Reaction occurs spontaneously if:(a) T∆S∆H and ∆H in +ve, ∆S is -ve (c) T∆S>∆H and both ∆H and T∆S are +ve (d) T∆S=∆H and both ∆H and T∆S are +ve

Answer»

ANSWER:

c

Explanation:

T◇shsh both ALSO the GOOD are +ve

Discussion

29.	What will happen to the entropy if liquid cristalize into solid ?? give reason in spport of your answer
Answer» ANSWER: here is our answer mate !! Explanation: When a liquid crystallizes into a solid, the molecules ATTAIN an ordered state and hence, entropy DECREASES. If temperature is raised to 115K, these begin to move and oscillate about their equilibrium positions in the lattice and system BECOMES more DISORDERED, hence entropy increases.

29.

What will happen to the entropy if liquid cristalize into solid ?? give reason in spport of your answer

Answer»

ANSWER:

here is our answer mate !!

Explanation:

When a liquid crystallizes into a solid, the molecules ATTAIN an ordered state and hence, entropy DECREASES. If temperature is raised to 115K, these begin to move and oscillate about their equilibrium positions in the lattice and system BECOMES more DISORDERED, hence entropy increases.

Discussion

30.	Which one of the following is the weakest
Answer» ANSWER: what's your QUESTIONS BUDDY??

30.

Which one of the following is the weakest

Answer»

ANSWER:

what's your QUESTIONS BUDDY??

Discussion

31.	Which of the following has the smallest size (a) Na (b) Na+ (c) Na- (d) Cl+
Answer» Among the given species, Cl⁺ has the SMALLEST size. As we MOVE across the period, the value of the atomic RADII of ATOMS decreases, hence the size of the atom becomes smaller. Since cations are smaller than the size of the atoms and anions are larger than the atoms, Na⁺ will be smaller than Na while Na⁻ will be larger compared to Na. Similarly, Cl⁺ will be very small. So, Cl⁺ will be the smallest ion among the given species.

31.

Which of the following has the smallest size (a) Na (b) Na+ (c) Na- (d) Cl+

Answer»

Among the given species, Cl⁺ has the SMALLEST size.

As we MOVE across the period, the value of the atomic RADII of ATOMS decreases, hence the size of the atom becomes smaller.
Since cations are smaller than the size of the atoms and anions are larger than the atoms, Na⁺ will be smaller than Na while Na⁻ will be larger compared to Na. Similarly, Cl⁺ will be very small.
So, Cl⁺ will be the smallest ion among the given species.

Discussion

32.	Calculate the number of moles in the 26 g of He (atomic mass- 4).
Answer» ANSWER: The GIVEN mass of Helium =26g. Thus the number of moles of Helium =given mass/molar mass. =26/4. =6.5

32.

Calculate the number of moles in the 26 g of He (atomic mass- 4).

Answer»

ANSWER:

The GIVEN mass of Helium =26g.

Thus the number of moles of Helium =given mass/molar mass.

=26/4.

=6.5

Discussion

33.	How many non metals in periodic table?
Answer» there are 17 NON METALS in PERIODIC table. .. FOLLOW me..

33.

How many non metals in periodic table?

Answer»

there are 17 NON METALS in PERIODIC table.

.. FOLLOW me..

Discussion

34.	Give 3 examples each of endothermic and exothermic reactions. (Note:- Make sure they are chemical reactions!)
Answer» Answer: endothermic- 1. melting ice cubes 2. melting SOLID SALTS 3. evaporating liquid WATER 4. converting frost to water exothermic- 1. combustion 2. DETONATION of nitroglycerin 3. nuclear fission of uranium-235 4.neutralization reactions

34.

Give 3 examples each of endothermic and exothermic reactions. (Note:- Make sure they are chemical reactions!)

Answer»

Answer:

endothermic- 1. melting ice cubes

2. melting SOLID SALTS

3. evaporating liquid WATER

4. converting frost to water

exothermic-

1. combustion

2. DETONATION of nitroglycerin

3. nuclear fission of uranium-235

4.neutralization reactions

Discussion

35.	ट्रू एंड फॉल्स क्या प्रिंटर सिर्फ ब्लैक और ऑरेंज कलर के ही होते हैं सही उत्तर दें
Answer» Answer: LANGUAGE prob .PLS ask in english Explanation: HOPE it HELPS U

35.

ट्रू एंड फॉल्स क्या प्रिंटर सिर्फ ब्लैक और ऑरेंज कलर के ही होते हैं सही उत्तर दें

Answer»

Answer:

LANGUAGE prob .PLS ask in english

Explanation:

HOPE it HELPS U

Discussion

36.	A) write the symbol and atomic number of first group elements
Answer» Answer: 1 HYDROGEN 3 lithium 11 sodium 19 potassium 37 rubinium 55 cerium 87 FRANCIUM

36.

A) write the symbol and atomic number of first group elements

Answer»

Answer:

1 HYDROGEN

3 lithium

11 sodium

19 potassium

37 rubinium

55 cerium

87 FRANCIUM

Discussion

37.	Identify oxidizing agent,reducing agent and oxidised productin the given equation below:1. H2S + Cl2→ 2HCl + S
Answer» ANSWER: Chlorine CL 2 is the oxidizing agent. It oxidizes H 2 S to S. Note: removal of hydrogen from a molecule is oxidation. H 2 S −H 2 S ...... oxidation. Addition of hydrogen is reduction. Cl 2 H 2 2HCl ...... reduction. Explanation: I HOPE this will help you

37.

Identify oxidizing agent,reducing agent and oxidised productin the given equation below:1. H2S + Cl2→ 2HCl + S

Answer»

ANSWER:

Chlorine CL

2

is the oxidizing agent. It oxidizes H

2

S to S.

Note: removal of hydrogen from a molecule is oxidation.

H

2

S

−H

2

S ...... oxidation.

Addition of hydrogen is reduction.

Cl

2

H

2

2HCl ...... reduction.

Explanation:

I HOPE this will help you

Discussion

38.	.PAGE NO.DATE:\|المعمملا مفصليحهعطيهis arbitrarily fixed as
Answer» EXPLANATION: DATE 8/12/20.............

38.

.PAGE NO.DATE:|المعمملا مفصليحهعطيهis arbitrarily fixed as

Answer»

EXPLANATION:

DATE 8/12/20.............

Discussion

39.	Vi)ln Rutherford'sGold foil experiment most of rays returns back to its path showng thata)most of the atom is hollowblatoms have dense nucleus at the centrechatom is sphericald)atom is neutral
Answer» Answer: Statement-I : In Rutherford's GOLD FOIL experiment, very few-particles are deflected BACK. Because Statement-II : Nucleus present inside the atom is HEAVY.

39.

Vi)ln Rutherford'sGold foil experiment most of rays returns back to its path showng thata)most of the atom is hollowblatoms have dense nucleus at the centrechatom is sphericald)atom is neutral

Answer»

Answer:

Statement-I : In Rutherford's GOLD FOIL experiment, very few-particles are deflected BACK.
Because
Statement-II : Nucleus present inside the atom is HEAVY.

Discussion

40.	Calculate the mass of 2 mole sulphuric acid
Answer» ANSWER: So, MASS of TWO MOLE of H2SO4=196 G.

40.

Calculate the mass of 2 mole sulphuric acid

Answer»

ANSWER:

So, MASS of TWO MOLE of H2SO4=196 G.

Discussion

41.	How does the reactivity of hg differ from that of zn and cd
Answer» ANSWER: the does the REACTIVITY of HG different from that of ZN and CD

41.

How does the reactivity of hg differ from that of zn and cd

Answer»

ANSWER:

the does the REACTIVITY of HG different from that of ZN and CD

Discussion

42.	Out of phapharus and copper, which one shows spontaneous combustion
Answer» ANSWER: PHOSPHORUS SHOWS SPONTANEOUS combustion Brainleist PLEASE

42.

Out of phapharus and copper, which one shows spontaneous combustion

Answer»

ANSWER:

PHOSPHORUS SHOWS SPONTANEOUS combustion

Brainleist PLEASE

Discussion

43.	The change of state from sold to liquid without going to liquid state is called
Answer» Answer: Most substances go through the logical PROGRESSION from SOLID to LIQUID to gas as they're heated — or vice versa as they're cooled. But a few substances go DIRECTLY from the solid to the gaseous state without ever becoming a liquid. Scientists call this process SUBLIMATION.

43.

The change of state from sold to liquid without going to liquid state is called

Answer»

Answer:

Most substances go through the logical PROGRESSION from SOLID to LIQUID to gas as they're heated — or vice versa as they're cooled. But a few substances go DIRECTLY from the solid to the gaseous state without ever becoming a liquid. Scientists call this process SUBLIMATION.

Discussion

44.	Explain Mendel’s dihybrid cross and discuss its results?
Answer» ANSWER: HYY dear ❤️ Explanation: Dihybrid CROSS is a betwēeñ twõ dîffêréñt lïñës/ gēñes thãt dïffèr în twō ōbservēd tràits . According tõ mēñdêl,s statement , bêtwēen the ALLELES ōf böth thēse loci, thērè is à rêlàtiõnship õf complêtely clõminant - recessivê traits . hope it's help you ❤️ mark me as brainlist follow me insta:Cute_chori6422 thank you

44.

Explain Mendel’s dihybrid cross and discuss its results?

Answer»

ANSWER:

HYY dear ❤️

Explanation:

Dihybrid CROSS is a betwēeñ twõ dîffêréñt lïñës/ gēñes thãt dïffèr în twō ōbservēd tràits . According tõ mēñdêl,s statement , bêtwēen the ALLELES ōf böth thēse loci, thērè is à rêlàtiõnship õf complêtely clõminant - recessivê traits .

hope it's help you ❤️

mark me as brainlist

follow me

insta:Cute_chori6422

thank you

Discussion

45.	Give an examplewhen n=2. CnH2n+ 2, CnH2n + 1, CnH2n, CnH2n -2
Answer» Answer: CnH2n+ 2 = C2H6 ETHANE CnH2n + 1 = C2H5 ETHYL group CnH2n = C2H4 ethene CnH2n -2 = C2H2 ethyne

45.

Give an examplewhen n=2. CnH2n+ 2, CnH2n + 1, CnH2n, CnH2n -2

Answer»

Answer:

CnH2n+ 2 = C2H6 ETHANE

CnH2n + 1 = C2H5 ETHYL group

CnH2n = C2H4 ethene

CnH2n -2 = C2H2 ethyne

Discussion

46.	Out of Li, Be, Mg, Al, P and Cl which have completely filled and half-filled orbitals consequentlylarge ionisation enthalpies
Answer» ANSWER: FOLLOW me................

46.

Out of Li, Be, Mg, Al, P and Cl which have completely filled and half-filled orbitals consequentlylarge ionisation enthalpies

Answer»

ANSWER:

FOLLOW me................

Discussion

47.	Complete and balance the equations: [4]1. K + H2O →2. Zn + H2O →3. Al + H2SO4→4. Zn + KOH →
Answer» k+ H2O 2 zn +h2O Al+H2SO4 zn+ KOH it is the WAY if you don't the you search to google

47.

Complete and balance the equations: [4]1. K + H2O →2. Zn + H2O →3. Al + H2SO4→4. Zn + KOH →

Answer»

k+ H2O

2 zn +h2O

Al+H2SO4

zn+ KOH it is the WAY if you don't the you search to google

Discussion

48.	Which one of the following is the weakest?(a) Ionic Bond (b) Covalent Bond (c) Metallic Bond (d) van der Waals’ forces
Answer» Answer: VAN der WAALS’ FORCES is the weakest AMONG them.

48.

Which one of the following is the weakest?(a) Ionic Bond (b) Covalent Bond (c) Metallic Bond (d) van der Waals’ forces

Answer»

Answer:

VAN der WAALS’ FORCES is the weakest AMONG them.

Discussion

49.	How many moles of co2 will left if 10^21 molecules are removed from 513.07mg of co2
Answer» Answer:- 0.01 mole Explanation:- • Molar mass of Carbon (C) = 12g/mol • Molar mass of OXYGEN (O) = 16g/mol • AVOGADRO Number = 6.022×10²³ Hence, molar mass of CO₂ :- = 12 + 16×2 = 12 + 32 = 44g/mol • Given Mass of CO₂ :- = 513.07mg= 0.51307g Number of moles in 0.51307g of CO₂ :- = Given Mass/Molar mass = 0.51307/44 = 0.0116 mole [APPROXIMATELY] Now, from 0.116 moles of CO₂ , 10²¹ molecules are removed. Number of moles in 10²¹ molecules of CO₂ :- = No of molecules/Avogadro Number = 10²¹/[6.022×10²³] = 1/[6.022×10²] = 1/602.2 = 0.0016 mole [approximately] Therefore, number of moles of CO₂ LEFT :- = 0.0116 - 0.0016 = 0.01 mole Thus, 0.01 mole of CO₂ are left.

49.

How many moles of co2 will left if 10^21 molecules are removed from 513.07mg of co2

Answer»

Answer:-

0.01 mole

Explanation:-

• Molar mass of Carbon (C) = 12g/mol

• Molar mass of OXYGEN (O) = 16g/mol

• AVOGADRO Number = 6.022×10²³

Hence, molar mass of CO₂ :-

= 12 + 16×2

= 12 + 32

= 44g/mol

• Given Mass of CO₂ :-

= 513.07mg= 0.51307g

Number of moles in 0.51307g of CO₂ :-

= Given Mass/Molar mass

= 0.51307/44

= 0.0116 mole [APPROXIMATELY]

Now, from 0.116 moles of CO₂ , 10²¹ molecules are removed.

Number of moles in 10²¹ molecules

of CO₂ :-

= No of molecules/Avogadro Number

= 10²¹/[6.022×10²³]

= 1/[6.022×10²]

= 1/602.2

= 0.0016 mole [approximately]

Therefore, number of moles of CO₂ LEFT :-

= 0.0116 - 0.0016

= 0.01 mole

Thus, 0.01 mole of CO₂ are left.

Discussion

50.	Calculate the energy required for the process He+ → He+2 + e‒. The ionization energy for Hatom in the ground state is 2.18 x 10‒18 J/atom.
Answer» ANSWER: delta E= 8.72 * 10 ^ -18 J The energy REQUIRED for the PROCESS

50.

Calculate the energy required for the process He+ → He+2 + e‒. The ionization energy for Hatom in the ground state is 2.18 x 10‒18 J/atom.

Answer»

ANSWER:

delta E= 8.72 * 10 ^ -18 J

The energy REQUIRED for the PROCESS

Discussion

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