CHAPTER : SOLUTIONS
ASSIGNMENT
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Question 1
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Dissolving 120 g of urea (mol. wt. 60) in 1000 g of water
gave a solution of density 1.15 g/mL. The molarity of the solution is
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A
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1.78 M
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B
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2.00 M
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C
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2.05 M
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D
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2.22 M
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Question 2
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A 5.2 molal aqueous solution of methyl alcohol, CH3OH
is supplied. What is the mole fraction of methyl alcohol in the solution?
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A
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0.050
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B
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0.100
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C
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0.190
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D
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0.086
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Question 3
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The molality of a urea solution in which 0.0100 g of urea,
[(NH2)2CO] is added to 0.3000 dm3 of
water at STP is
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A
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3.33 × 10–2 m
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B
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0.555 m
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C
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5.55 × 10–4 m
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D
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33.3 m
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Question 4
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18 g of glucose (C6H12O6)
is added to 178.2 g of water. The vapour pressure of water for this aqueous
solution at 100°C is
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A
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7.60 torr
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B
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76.00 torr
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C
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752.40 torr
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D
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759.00 torr
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Question 5
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Density of a 2.05 M solution of acetic acid in water is 1.20
g/mL. The molarity of the solution is
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A
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3.28 mol kg-1
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B
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2.28 mol kg-1
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C
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0.44 mol kg-1
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D
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2.14 mol kg-1
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Question 6
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The vapour pressure of two liquids P and Q are 80 and 60
torr respectively. The total vapour pressure of solution obtained by mixing 3
mol of P and 2 mol of Q would be
|
A
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72 torr
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B
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140 torr
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C
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68 torr
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D
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20 torr
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Question 7
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A solution of urea (mol. mass = 56 g mol-1) boils
at 100.18°C at the atmospheric pressure. If Kf and Kb for
water are 1.86 and 0.512 K kg mol-1 respectively, then the
above solution will freeze at
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A
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0.654°C
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B
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–0.654°C
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C
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6.54°C
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D
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–6.54°C
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Question 8
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Two solutions of a substance (non-electrolyte) are mixed in
the following manner:
480 mL of 1.5 M first solution + 520 mL of 1.2 M second
solution.
What is the molarity of the final mixture?
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A
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1.20 M
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B
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1.50 M
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C
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1.344 M
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D
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2.70 M
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Question 9
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Equimolar solution in the same solvent have
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A
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same boiling point but different freezing point
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B
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same freezing point but different boiling point
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C
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same boiling point and same freezing point
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D
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different boiling point and different freezing point
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Question 10
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Molarity of 0.2 N H2SO4 is
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A
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0.2
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B
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0.4
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C
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0.6
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D
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0.1
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