Class 12 Chemistry Chapter 2 Solutions Short Questions with Answers | Class 12 Chemistry Chapter 2 Solutions Quiz

What would be tne volume of 15% w/v and 5% w/v NaOH solution required to prepare 1 litre aqueous solution of 2M NaOH ? (M.w of Naoh = 40 gram/mole)

A 300 ml, 700ml

B 250 ml, 750ml

C 400 ml, 600ml

D 280 ml, 720ml

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Answer:300 ml, 700ml

2 At constant temperature, vapour pressure of an aqueous solution of 1.5 kg glucose decreases to 0.98% in comparision with vapour pressure of pure water then, what quantity of glucose in gram dissolved in the solution ? (Molecular weight of glucose = 180 gm/mole)

A 148.5 gm

B 14.85 gm

C 125 gm

D 135 gm

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Answer: 135 gm

3 At constant pressure, 0.5 m NaCl aqueous solution is diluted by adding water in it. Which of the following statement is correct in this reference ?

A Van’t Hoff factor (i) and boiling point of the solution both decreases

B Van’t Hoff factor (i) and boiling point of the solution both increases

C Van’t Hoff factor (i) decreases while boiling point of the solution both increases

D Van’t Hoff factor (i) increases while boiling point of the solution both decreases

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Answer:Van’t Hoff factor (i) increases while boiling point of the solution both decreases

4 Boiling point of an aqueous solution of 0.5 m ionic solid substance is 100.5°C; then state the value of i ? (Kb = 0.512oC -kg – mole-1)

A 1.95

B 1.85

C 1.25

D 0.85

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Answer:1.95

5 Aqueous solution of substance boils at 100.5oC at 1 bar pressure; then at what temperature it freezes ? (Kb = 0.512oC -kg - mole-1, Kf = 1.86oC - kg – mole-1)

A 11.2oC

B 29.84oF

C 271.8oK

D -1.2oC

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Answer: 271.8oK

6 1.4 m aqueous solution of a weak electrolyte AB2 ionizes 20%, then, state boiling point and freezing point of the solution respectively.

A 100.86oC, -3.12oC

B 101oC, -3.65oC

C 274oC, -3.65oC

D 374oC, -3.65oC

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Answer: 101oC, -3.65oC

7 Solute substance in a 1.4 m aqueous solution associates by 25%, then, find the boiling point and freezing point of solution; where, solute exists as trimer in the solution; thus, n = 3. (Kb =0.512oC • kg • mole-1, Kf = 1.86oC • kg • mole-1)

A 100.448oC, -2.28oC

B 373.58oK, -3.65oC

C 100.59oC, 2.17oC

D 213oF, 270.83ok

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Answer: 213oF, 270.83ok

8 Molecular mass of a weak acid HA is 60gm/mo1 Ifs experimental molecular mass in its 0.7 M aqueous solution obtained from colligative properties is 50gm/mo1. Then calculate ionistion consteint of weak acid HA.

A 0.023

B 0.0085

C 0.035

D 0.085

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Answer:0.035

9 At constant temperature, the total pressure of a homogeneous mixture of gas-A and gas-B in a closed container collected on water is 2.0 bar. Their ratio of mole frachion is 1.6 If the values of their KH are 2.4 ×10+4 bur and 4.8 ×104 bar respectively then calcwate its ration of mole fraction when dissolhed in H2O.

A 1:2

B 2:1

C 3:1

D 1:3

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Answer: 1:3

10 Naphthalene is soluble in ether or benzene because. ?

A dipole-dipole attraction is equal

B London forces are equal

C Hydrogen bond

D Ionic attraction

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Answer: London forces are equal

11 Four Liauids are given.
(i) Water : more polar and capacity to torm H-bond.
(ii) Hexanol : moderatly pdar and partial capacity to form H-bond.
(iii) Chloro form : moderatly polar and does not capable to form H-bond.
(iv) Octane : non polar and does not capable to form H-bond.
which of the following pair of liquids mixed with each other in very less proportion.

A I, IV

B I, II

C II, III

D III, IV

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