CHEMISTRY | CHAPTER: SOLUTIONS | PRACTICE
QUESTIONS (MCQ) | IMPORTANT QUESTIONS FOR
BOARD AND COMPETITIVE EXAMS
1. If the mole fraction of a solute in an aqueous solution is 0.50, the molality of the
solution is:
(a) 1.55 (b) 55.55 (c) 0.5 (d) 5.55
2. Equal volumes of 0.50 M HCl, 0.25 M NaOH and 2.75 M NaCl are mixed. The molarity
of the NaCl solution is: [ H = 1u, Na = 23u, Cl = 35.5u ]
(a) 0.75 M (b) 1.00 M (c) 0.50 M (d) 2.00 M
3. A sample of H2SO4 (density 1.8 g/mL) is 90% by weight. What is the volume of the acid
that has to be used to make 1 L of 0.2 M H2SO4? [ H = 1u, S = 32u, Cl = 35.5u]
(a) 16 mL (b) 10 mL (c) 12 mL (d) 18 mL
4. The relative lowering of the vapour pressure of an aqueous solution containing a non-
volatile solute is 0.0125. The molality of the solution is:
(a) 0.70 (b) 0.50 (c) 0.80 (d) 0.40
5. The vapour pressure of a deliquescent substance is
(a) equal to the atmospheric pressure
(b) equal to that of the water vapour in air
(c) greater than that of the water vapour in air
(d) less than that of the water vapour in air
6. Which of the following aqueous solutions has the highest boiling point?
(a) 0.1M KNO3 (b) 0.1M Na3PO4 (c) 0.1M BaCl2 (d) 0.1M K2SO4
7. When mercuric iodide is added to an aqueous solution of KI, the
(a) freezing point is raised (b) freezing point is lowered
(c) boiling point does not change (d) freezing point does not change
8. If a solute undergoes dimerization and trimerization, the minimum values of the van’t
Hoff factors are
(a) 0.50 and 1.50 (b) 1.50 and 1.33 (c) 0.50 and 0.33 (d) 0.25 and 0.67
9. Calculate the ebullioscopic constant for water. The heat of vaporization is 40.685
kJ/mol.
(a) 0.512 K kg/mol (b) 5.12 K kg/mol (c) 1.86 K kg/mol (d) 3.56 K kg/mol
QUESTIONS (MCQ) | IMPORTANT QUESTIONS FOR
BOARD AND COMPETITIVE EXAMS
1. If the mole fraction of a solute in an aqueous solution is 0.50, the molality of the
solution is:
(a) 1.55 (b) 55.55 (c) 0.5 (d) 5.55
2. Equal volumes of 0.50 M HCl, 0.25 M NaOH and 2.75 M NaCl are mixed. The molarity
of the NaCl solution is: [ H = 1u, Na = 23u, Cl = 35.5u ]
(a) 0.75 M (b) 1.00 M (c) 0.50 M (d) 2.00 M
3. A sample of H2SO4 (density 1.8 g/mL) is 90% by weight. What is the volume of the acid
that has to be used to make 1 L of 0.2 M H2SO4? [ H = 1u, S = 32u, Cl = 35.5u]
(a) 16 mL (b) 10 mL (c) 12 mL (d) 18 mL
4. The relative lowering of the vapour pressure of an aqueous solution containing a non-
volatile solute is 0.0125. The molality of the solution is:
(a) 0.70 (b) 0.50 (c) 0.80 (d) 0.40
5. The vapour pressure of a deliquescent substance is
(a) equal to the atmospheric pressure
(b) equal to that of the water vapour in air
(c) greater than that of the water vapour in air
(d) less than that of the water vapour in air
6. Which of the following aqueous solutions has the highest boiling point?
(a) 0.1M KNO3 (b) 0.1M Na3PO4 (c) 0.1M BaCl2 (d) 0.1M K2SO4
7. When mercuric iodide is added to an aqueous solution of KI, the
(a) freezing point is raised (b) freezing point is lowered
(c) boiling point does not change (d) freezing point does not change
8. If a solute undergoes dimerization and trimerization, the minimum values of the van’t
Hoff factors are
(a) 0.50 and 1.50 (b) 1.50 and 1.33 (c) 0.50 and 0.33 (d) 0.25 and 0.67
9. Calculate the ebullioscopic constant for water. The heat of vaporization is 40.685
kJ/mol.
(a) 0.512 K kg/mol (b) 5.12 K kg/mol (c) 1.86 K kg/mol (d) 3.56 K kg/mol
