Quiz 9 for Class 12 Chemistry Chapter 2 Solutions

July 8, 2022July 8, 2022 dev mcq quiz, solutions

Quiz 9 for Class 12 Chemistry Chapter 2 Solutions

Your score will be displayed after submitting the quiz.

/15

0 votes, 0 avg

Quiz 9 : Solutions - Class 12 Chemistry

Negative Marking :- No

Weightage per Question :- 1 Mark

Number of Questions :- 15

Duration of Quiz :- 15 min

1 / 15

1) 138 g of ethyl alcohol is mixed with 72 g of water. The ratio of mole fraction of alcohol to water is.

a) 1 : 4

b) 1 : 2

c) 1 : 1

d) 3 : 4

2 / 15

2) An aqueous solution boils at 100.512 °C. The freezing point of the solution is (K_f = 1.86 K Kg mol⁻¹ and K_b = 0.512 K Kg mol⁻¹) :

a) 0.93 °C

b) −0.93 °C

c) −1.86 °C

d) 1.86 °C

3 / 15

3) What happens when an egg is kept in saturated solution of NaCl after removing its hard shell in dilute HCl ?

a) Egg will remain same

b) Egg will first shrink and then swell

c) Egg will swell

d) Egg will shrink

4 / 15

4) Among the following, the azeotropic mixture is :

a) CCl₄ + CHCl₃

b) C₆H₅Br + C₆H₅Cl

c) C₂H₅Br + C₂H₅Cl

d) C₆H₁₄ + C₇H₁₆

5 / 15

5) The freezing point of 1 % solution of lead nitrate in water will be :

a) 1 °C

b) 0 °C

c) below 0 °C

d) 2 °C

6 / 15

6) At 298 K, the total pressure of an ideal solution obtained by mixing 3 moles of ‘A’ and 2 moles of ‘B’ is 184 torr. What is the vapour pressure (in torr) of pure ‘B’ at the same temperature ? (Vapour pressure of ‘A’ at 298 K is 200 torr)

a) 140

b) 160

c) 120

d) 100

7 / 15

7) What is the molality of a solution containing 200 mg of urea (molar mass 60 gm/mol) dissolved in 40 gm of water ?

a) 0.742

b) 0.825

c) 0.498

d) 0.083

8 / 15

8) Calculate the mass of urea (NH₂CONH₂) required in making 2.5 Kg of 0.25 molal aqueous solution.

a) 75.3 gm

b) 73.5 gm

c) 37.5 gm

d) 53.7 gm

9 / 15

9) Henry’s law constant of oxygen is 1.4 × 10^-3 mol L^-1 atm^-1 at 298 K. How much of oxygen is dissolved in 100 mL at 298 K when the partial pressure of oxygen is 0.5 atm ?

a) 1.4 mg

b) 3.2 mg

c) 2.24 mg

d) 2.82 mg

10 / 15

10) Which of the following can be measured by the Ostwald-Walker dynamic method ?

a) All of the above

b) Lowering of Vapour pressure

c) Relative lowering of vapour pressure

d) Vapour pressure of the solvent

11 / 15

11) The volume of 10 N and 4 N HCl required to make 1 L of 7 N HCl are :

a) 0.80 L of 10 N HCl and 0.20 L of 4 N HCl

b) 0.50 L of 10 N HCl and 0.50 L of 4 N HCl

c) 0.60 L of 10 N HCl and 0.40 L of 4 N HCl

d) 0.25 L of 10 N HCl and 0.75 L of 4 N HCl

12 / 15

12) P_A and P_B are the vapour pressure of pure liquid components A and B respectively of an ideal binary solution. If ‘X_A‘ represents the mole fraction of component ‘A’, the total vapour pressure of the solution will be:

a) P_B + X_A (P_A − P_B)

b) P_B + X_A (P_B − P_A)

c) P_A + X_A (P_B − P_A)

d) P_A + X_A (P_A − P_B)

13 / 15

13) Two liquids ‘A’ and ‘B’ have vapour pressure of 0.685 bar and 0.264 bar respectively. In an ideal solution of the two, the mole fraction of ‘A’ at which the two liquids have equal partial pressure is :

a) 0.286

b) 0.386

c) 0.714

d) 0.306

14 / 15

14) The molarity of a solution containing 5.0 gm of NaOH in 250 mL solution is :

a) 0.4 M

b) 0.2 M

c) 0.1 M

d) 0.5 M

15 / 15

15) Which of the following pair of solutions are expected to be isotonic at the same temperature ?

a) 0.1 M NaCl and 0.1 M Na₂SO₄

b) 0.1 M urea and 0.2 M MgCl₂

c) 0.2 M urea and 0.2 M NaCl

d) 0.1 M Ca(NO₃)₂ and 0.1 M Na₂SO₄

Your score is

Please rate this quiz

Quick Links (Solutions)

You can read and download our notes

You can practice multiple choice questions.

You can practice short and long answer questions

You can watch our pre-recorded video lectures.

You can participate in multiple choice questions quiz.

Quiz 9 for Class 12 Chemistry Chapter 2 Solutions

Quick Links (Solutions)

You May Also Like