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% |
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
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 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
If 22 g of benzene is dissolved in 122 g of CCl4, the mass percentage of CCl4 and benzene respectively are-
1.
2.
3.
4. 91.28 %, 8.72 %
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) |
To make 2.5 kg of 0.25 m aqueous solution, the mass of urea required is-
1. | 73 g | 2. | 37 g |
3. | 48 g | 4. | 24 g |
The solubility of H2S in water at STP is 0.195 m. The value of Henry's constant is-
1. | 274 atm | 2. | 285 atm |
3. | 295 atm | 4. | 278 atm |