Physical Chemistry MCQ with Answers

151) The density (in gm⁄mL) of a 3.6M sulphuric acid solution that is 29% H₂SO₄ by mass will be:

Answer is:

1.22

152) If the amount of a nonelectrolyte dissolved is doubled, but that of solvent is quadrupled, the elevation in the boiling point of the solution will be:

Answer is:

Halved

Explanation:

If the amount of a nonelectrolyte dissolved is doubled, but that of solvent is quadrupled, the elevation in the boiling point of the solution will be Halved.

153) The molal boiling point constant for water is 0.51^oC kg⁄mol. When 0.1 mol of sugar is dissolved in 200 gm of water, the solution boils under a pressure of 1 atm at

Answer is:

100.255^oC

Explanation:

ΔT_b = K_bm

154) KBr is 80% dissociated in solution. The freezing point of 0.5m solution is:

Answer is:

271.326 K

155) An aqueous solution is 1m in KI. What change will cause the vapour pressure of the solution to increase?

Answer is:

Addition of water

Explanation:

Addition of water to an aqueous solution of KI, causes the concentration of the solution to decrease, thereby increasing the vapour pressure.

151) The density (in gm⁄mL) of a 3.6M sulphuric acid solution that is 29% H2SO4 by mass will be:

1.22

152) If the amount of a nonelectrolyte dissolved is doubled, but that of solvent is quadrupled, the elevation in the boiling point of the solution will be:

Halved

153) The molal boiling point constant for water is 0.51oC kg⁄mol. When 0.1 mol of sugar is dissolved in 200 gm of water, the solution boils under a pressure of 1 atm at

100.255oC

154) KBr is 80% dissociated in solution. The freezing point of 0.5m solution is:

271.326 K

155) An aqueous solution is 1m in KI. What change will cause the vapour pressure of the solution to increase?

Addition of water

151) The density (in gm⁄mL) of a 3.6M sulphuric acid solution that is 29% H₂SO₄ by mass will be:

153) The molal boiling point constant for water is 0.51^oC kg⁄mol. When 0.1 mol of sugar is dissolved in 200 gm of water, the solution boils under a pressure of 1 atm at

100.255^oC