MCQs on Solutions Chemistry

MCQs on Solutions Chemistry

1. The mole fraction of the solute in one molal aqueous solution is

1. 0.009
2. 0.018
3. 0.027
4. 0.036

Answer: (b)

2. 5 cm³ of acetone is added to 100 cm³ of water, the vapour pressure of water over the solution will be

1. equal to the vapour pressure of pure water.
2. less than the vapour pressure of pure water.
3. greater than the vapour pressure of pure water.
4. very large.

Answer: (b)

3. The density of a solution prepared by dissolving 129g of urea in 1000g of water is 1.15g/ml. The molarity of this solution is

1. 1.78M
2. 1.02M
3. 2.05M
4. 0.50M

Answer: (c)

4. If at a certain temperature the vapour pressure of pure water is 25 mm Hg and that of a very dilute aqueous urea solution is 24.5 mm Hg, the molality of the solution is:

1. 0.02
2. 1.2
3. 1.11
4. 0.08

Answer: (c)

5. The relationship between osmotic pressure at 273K when 10g glucose (P1), 10g urea (P2) and 10g sucrose (P3) are dissolved in 250ml of water is

1. P1 > P2 > P3
2. P3 > P1 > P2
3. P2 > P1 > P3
4. P2 > P3 > P1

Answer: (c)

6. Two liquids X and Y form an ideal solution. At 300K vapour pressure of the solution containing 1mol of X and 3 mol of Y is 550 mm Hg. At the same temperature, if 1 mol of Y is further added to this solution, the vapour pressure of the solution increases by 10 mm Hg. Vapour pressure of X and Y in the pure states will be respectively

1. 300 and 400
2.  400 and 600
3. 500 and 600
4. 200 and 300

Answer: (b)

7. Mixing up equal volumes of 0.1M NaOH and 0.1M CH₃COOH yields a solution which is

1. basic
2. acidic
3. neutral
4. None

Answer: (a)

8. Equal volumes of 0.1M AgNO₃ and 0.2M NaCl are mixed. The concentration of NO₃^– ions in the mixture will be

1. 0.1M
2. 0.05M
3. 0.2M
4. 0.15M

Answer: (b)

9. Which of the following should be done in order to prepare 0.4M NaCl starting with 100ml of 0.3M NaCl?

1. add 5.85g of NaCl
2. and 20ml water
3. add 0.01 mol NaCl
4. evaporate 10ml of water

Answer: (c)

10. The volume of 0.025M H₃PO₄ required to neutralise 25ml of 0.03M Ca(OH)₂ is

1. 20ml
2. 25ml
3. 40ml
4. 50ml

Answer: (a)