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 |
The depression in the freezing point of water when 10 g of CH3CH2CHClCOOH is added to 250 g of water will be:
(Ka = 1.4 × 10–3, Kf = 1.86 K kg mol–1)
1. 0.32 K
2. 2.87 K
3. 0.65 K
4. 5.03 K
19.5 g of CH2FCOOH is dissolved in 500 g of water. The van’t Hoff factor and dissociation constant of fluoroacetic acid will be respectively: ( = 1.00 K )
1. | 20.75 , 4.77 × 10–3 | 2. | 1.075 , 4.77 × 10–2 |
3. | 2.073 , 3.07 × 10–4 | 4. | 1.075 , 3.07 × 10–3 |
Henry’s law constant for the solution of methane in benzene at 298 K is 4.27 × 105 mm Hg. The mole fraction of methane in benzene at 298 K under 760 mm Hg will be:
1. 1.85 × 10–5
2. 192 × 10–4
3. 178 × 10–5
4. 18.7 × 10–5
100 g of liquid A (molar mass 140 g mol–1) was dissolved in 1000 g of liquid B (molar mass 180 g mol–1). The vapour pressure of pure liquid B was found to be 500 torr. If the total vapour pressure of the solution is 475 torr, the vapour pressure of pure liquid A will be:
1. | 326 torr | 2. | 226 torr |
3. | 360.7 torr | 4. | 280.7 torr |
The major component of air is nitrogen with approximately 79% by volume at 298 K. The water is in equilibrium with air at a pressure of 10 atm. At 298 K. if the Henry’s law constant for nitrogen at 298 K is 6.51 × 107 mm respectively, then the composition of nitrogen in air will be :
1. 12.4 × 10−5
2. 9.22 × 10−5
3. 3.54 × 10−5
4. 4.96 × 10−5
The amount of CaCl2 (i = 2.47) dissolved in 2.5 litre of water such that its osmotic pressure is 0.75 atm at 27 °C is:
1. | 1.02 g | 2. | 4.35 g |
3. | 2.87 g | 4. | 3.42 g |
The type of inter molecular interactions present in
(a) | Methanol and Acetone | (i) | Van der Waal’s forces of attraction |
(b) | Acetonitrile and Acetone | (ii) | ion-dipole interaction |
(iii) | dipole-dipole interaction |
(a) | (b) | |
1. | (iii) | (ii) |
2. | (ii) | (ii) |
3. | (iii) | (iii) |
4. | (iii) | (i) |
The solubility of a gas in a liquid decreases with an increase in temperature because:
1. | Dissolution of a gas in a liquid is an endothermic process. |
2. | Dissolution of a gas in a liquid is an exothermic process. |
3. | Gases are highly compressible. |
4. | All of the above. |
To minimize the painful effects accompanying deep sea diving, oxygen diluted with less soluble helium gas is used as breathing gas by the divers. This is an example of the application of:
1. | Raoult's law | 2. | Henry's law |
3. | Ideal gas Equation | 4. | All of the above |