# The partial pressure of ethane over a solution containing 6.56 × 10–2 g of ethane is 1 bar. If the solution contains 5.00 × 10–2 g of ethane, the partial pressure of the gas will be: 1. 0.66 bar 2. 0.96 bar 3. 0.76 bar 4. 0.19 bar

Subtopic:  Concentration Terms & Henry's Law |
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The positive deviations from Raoult’s law mean the vapour pressure is:

1. Higher than expected.
2. Lower than expected.
3. As expected.
4. None of the above

Subtopic:  Raoult's Law |
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The vapour pressure of 1 molal solution of a non-volatile solute in water at 300 K would be:

(The vapour pressure of water at 300 K = 12.3 kPa)

 1 21.08 kPa 2 12.08 kPa 3 33.08 kPa 4 4.08 kPa
Subtopic:  Relative Lowering of Vapour Pressure |
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A solution containing 30 g of non-volatile solute in 90 g of water has a vapour pressure of 2.8 kPa at 298 K. Further, 18 g of water is then added to the solution and the new vapour pressure becomes 2.9 kPa at 298 K. The vapour pressure of water at 298 K will be -

1) 1.53 kPa

2) 2.53 kPa

3) 3.53 kPa

4) 4.53 kPa

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Two elements A and B form compounds having formula AB2 and AB4. When dissolved in 20 g of benzene (C6H6), 1 g of AB2 lowers the freezing point by 2.3 K whereas 1.0 g of AB4 lowers it by 1.3 K. The atomic masses of A and B are respectively:

(Kf for benzene is 5.1 K kg mol-1)

1. 15.59 u and 52.64 u

2. 25.59 u and 42.64 u

3. 13.59 u and 52.64 u

4. 23.59 u and 32.64 u

Subtopic:  Depression of Freezing Point |
61%
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The type of inter-molecular interactions present in:

 (a) n-Hexane and n-octane (i) Van der Waal’s forces of attraction (b) NaClO4 and water (ii) Ion-dipole interaction (iii) Dipole-dipole interaction

 (a) (b) 1. (i) (ii) 2. (ii) (ii) 3. (i) (iii) 4. (iii) (iii)
Subtopic:  Azeotrope |
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The insoluble compound in water is /are:

1. Phenol

2. Formic acid and toluene

3. Phenol and toluene

4. Toluene and chloroform

Subtopic:  Introduction & Colligative properties |
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The mass percentage of aspirin (C9H8O4) in acetonitrile (CH3CN) when 6.5 g of C9H8O4 is dissolved in 450 g of CH3CN will be:
1. 1.424%
2. 4.424%
3. 5.124%
4. 2.124%

Subtopic:  Concentration Terms & Henry's Law |
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Nalorphene (C19H21NO3), similar to morphine, is used to combat withdrawal symptoms in narcotic users. The dose of nalorphene generally given is 1.5 mg.

Calculate the mass of 1.5 × 10−3m aqueous solution required for the above dose.
1. 13.22 g
2. 3.22 g
3. 11.22 g
4. 9.22 g

Subtopic:  Concentration Terms & Henry's Law |
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The amount of benzoic acid (C6H5COOH) required for preparing 250 mL of 0.15 M solution in methanol is:

 1 4.57 g 2 3.57 g 3 1.57 g 4 12.57 g
Subtopic:  Concentration Terms & Henry's Law |
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