1. Upon mixing 4 moles of A with 4 moles of B, the resulting ideal solution has a total of 5 moles in the liquid phase.If the mole fraction of A in the liquid phase is 0.4, the mole fraction of A in the vapor phase is
(A) 0.2
(B) 0.4
(C) 0.6
(D) 0.67

Ans: (D) 0.67

2. 10 cm³ of 0.1 N monobasic acid requires 15 cm³ of sodium hydroxide whose normality is :
(A) 1.5 N
(B) 0.15 N
(C) 0.066 N
(D) 0.66 N

Ans: (C) 0.066 N

3. The osmotic pressure of a 500ml solution containing 7g of a protein at 300K is found to be 42 x 10^-3 bar. The molar mass of the protein is (R = 0.08 L bar K^-1 mol^-1)
(A) 8000 g mol^-1
(B) 4000 g mol^-1
(C) 8 g mol^-1
(D) 4 g mol^-1

Ans: (A) 8000 g mol^-1

4. Molarity of 0.2 N H₂SO₄ is __________.
(A) 0.2
(B) 0.4
(C) 0.6
(D) 0.1

Ans: (D) 0.1

5. A solution contains 1.2046 x 10²⁴ hydrochloric acid molecules in one dm³ of the solution. The strength of the solution is :
(A) 4 N
(B) 8 N
(C) 6 N
(D) 2 N

Ans: (D) 2 N

6. Hydrogen diffuses six times faster than gas A. The molar mass of gas A is:
(A) 24
(B) 36
(C) 72
(D) 6

Ans: (C) 72

7. At a temperature of 0^oC , snow is falling on a footpath which has patches of common salt spread on it. Which of the following statements is CORRECT?
(A) Snow will melt faster on the patches where common salt is present.
(B) Reaction of salt with water is exothermic which melts the snow on the patches of common salt.
(C) Common salt will have no effect on the melting of snow.
(D) Common salt will evaporate leading to uniform layer of snow on the footpath

Ans: (A) Snow will melt faster on the patches where common salt is present.

8. To prepare a solution with molality of 0.1 mol kg ^-1 of ethanol in 100g of water, the mass of ethanol needed is (molecular weight of ethanol = 46 g mol^-1)
(A) 0.46 g
(B) 4.6 g
(C) 46 g
(D) 460 g

Ans: (A) 0.46 g

9. Osmotic pressure of the solution can be increased by,
(A) increasing the temperature of the solution
(B) decreasing the temperature of the solution
(C) increasing the volume of the vessel
(D) diluting the solution

Ans: (A) increasing the temperature of the solution

10. 25 cm³ of oxalic acid completely neutralised 0.064 g of sodium hydroxide.Molarity of the oxalic acid solution is
(A) 0.045
(B) 0.032
(C) 0.064
(D) 0.015

Ans: (B) 0.032

11.Solution 'A' contains acetone dissolved in chloroform and solution 'B' contains acetone dissolved in carbon disulphide.The type of deviations from Raoult's law shown by solutions A and B, respectively are:
(A) positive and positive
(B) negative and negative
(C) positive and negative
(D) negative and positive

Ans: (D) negative and positive

12.A non-volatile solute, 'A' tetramerises in water to the extent of 80%. 2.5 g of 'A' in 100 g of water , lowers the freezing point by 0.3^oC. The molar mass of A in mol L^-1 is (K_f for water = 1.86 K kg mol^-1)
(A) 62
(B) 155
(C) 221
(D) 354

Ans: (A) 62

13.Copper dissolved in gold is an example of ___________solutions
(A) Gaseous
(B) Liquid
(C) Solid
(D) Binary

Ans: (C) Solid

14.A solution contains 1.2046 x 10²⁴ hydrochloric acid molecules in one dm3 of the solution. The strength of the solution is :
(A) 4N
(B) 8N
(C) 6N
(D) 2N

Ans: (D) 2N