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Q. No.| 1. | \(\Delta_{mix} V\) = 0 | 2. | \(\Delta_{mix} S\) = 0 |
| 3. | Obeyance to Roult's Law | 4. | \(\Delta_{mix} H\) = 0 |
Calculate the vapour pressure of a solution prepared by mixing 25.5 g of chloroform (CHCl₃) and 40 g of dichloromethane (CH₂Cl₂) at 25°C.
Given:
Vapour pressure of pure CHCl₃ = 200 mmHg
Vapour pressure of pure CH₂Cl₂ = 415 mmHg
Molar mass of CHCl₃ = 119.5 g mol⁻¹
Molar mass of CH₂Cl₂ = 85 g mol⁻¹
| 1. | 90.40 mm Hg | 2. | 119.5 mm Hg |
| 3. | 348 mm Hg | 4. | 173.9 mm Hg |
A solution of acetone in ethanol:
| 1. | Shows a negative deviation from Raoult's law |
| 2. | Shows a positive deviation from Raoult's law |
| 3. | Behaves like a near-ideal solution |
| 4. | Obeys Raoult's law |
The vapour pressure of two liquids 'P' and 'Q' are 80 and 60 torr, respectively. The total vapour pressure of the solution obtained by mixing 3 moles of P and 2 moles of Q would be:
1. 68 torr
2. 140 torr
3. 72 torr
4. 20 torr
A solution has a 1:4 mole ratio of pentane to hexane.
The vapor pressures of the pure hydrocarbons at 20 ºC are
440 mm Hg for pentane and 120 mm Hg for hexane.
The mole fraction of pentane in the vapor phase would be:
| 1. | 0.200 | 2. | 0.478 |
| 3. | 0.949 | 4. | 0.786 |
Which of the following statements is correct for an ideal solution ?
| 1. | A – B attraction force is greater than A – A and B – B. |
| 2. | A – B attraction force is less than A – A and B – B. |
| 3. | Attraction force remains the same in A – A and B – B. |
| 4. | The volume of the solution is different from the sum of the volume of the solute and solvent. |
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