Solutions: MCQs | Question – Paper 1 1

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Topic: Solutions, Test No.: 01, Total MCQs: 15

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Question 1

pA and pB are the vapour pressure of pure liquid components, A and B, respectively of an ideal binary solution. If xA represents the mole fraction of component A, the total pressure of the solution will be [CBSE AIPMT 2012]

A

pB+ xA (pB – pA)

B

pB+ xA (pA – pB)

C

pA+ xA (pB – pA)

D

pA+ xA (pA – pB)

Question 2

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 [IIT JEE 2011]

A
1.78 M
B
2.00 M
C
2.05 M
D
2.22 M
Question 3

A solution of two liquids boils at a temperature more than the boiling point of either of them. Hence, the binary solution shows ______. [Karnataka CET 2011]

A
negative deviation from Raoult's law
B
positive deviation from Raoult's law
C
no deviation from Raoult's law
D
positive or negative deviation from Raoult's law depending upon the composition
Question 4

A 5.2 molal aqueous solution of methyl alcohol, CH3OH is supplied. What is the mole fraction of methyl alcohol in the solution? [AIEEE 2011]

A
0.050
B
0.100
C
0.190
D
0.086
Question 5

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 [AIEEE 2011]

A

3.33 × 10–2 m

B
0.555 m
C

5.55 × 10–4 m

D
33.3 m
Question 6

1.00 g of non-electrolyte solute (molar mass 250 g mol-1) was dissolved in 51.2 g of benzene. If the freezing point depression constant, Kf of benzene is 5.12 K kg mol-1, the freezing point of benzene will be lowered by [CBSE AIPMT 2006]

A
0.3 K
B
0.5 K
C
0.2 K
D
0.4 K
Question 7
A solution of acetone in ethanol [CBSE AIPMT 2006]
A
shows a positive deviation from Raoult's law
B
behaves like a near ideal solution
C
obeys Raoult's law
D
shows negative deviation from Raoult's law
Question 8

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 [AIEEE 2006]

A
7.60 torr
B
76.00 torr
C
752.40 torr
D
759.00 torr
Question 9

Density of a 2.05 M solution of acetic acid in water is 1.20 g/mL. The molarity of the solution is [AIEEE 2006]

A

3.28 mol kg-1

B

2.28 mol kg-1

C

0.44 mol kg-1

D

2.14 mol kg-1

Question 10

A solution has 1 : 4 mole ratio of pentane to hexane. The vapour pressure of pure hydrocarbons at 20°C are 400 mm Hg for pentane and 120 mm Hg for hexane. The mole fraction of pentane in the vapour phase would be [CBSE AIPMT 2005]

A
0.200
B
0.549
C
0.786
D
0.478
Question 11

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 [CBSE AIPMT 2005]

A
72 torr
B
140 torr
C
68 torr
D
20 torr
Question 12

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 [CBSE AIPMT 2005]

A
0.654°C
B
–0.654°C
C
6.54°C
D
–6.54°C
Question 13

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? [AIEEE 2005]

A
1.20 M
B
1.50 M
C
1.344 M
D
2.70 M
Question 14
Equimolar solution in the same solvent have [AIEEE 2005]
A
same boiling point but different freezing point
B
same freezing point but different boiling point
C
same boiling point and same freezing point
D
different boiling point and different freezing point
Question 15

Molarity of 0.2 N H2SO4 is [Karnataka CET 2005]

A
0.2
B
0.4
C
0.6
D
0.1
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