- 1(current)
Q. No.The correct option for the value of vapour pressure of a solution at 45 C with benzene to octane in a molar ratio 3:2 is:
[At 45 C vapour pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg. Assume Ideal gas]
| 1. | 336 mm of Hg | 2. | 350 mm of Hg |
| 3. | 160 mm of Hg | 4. | 168 mm of Hg |
1. Benzene + Toluene
2. Acetone + Chloroform
3. Chloroethane + Bromoethane
4. Ethanol + Acetone
The correct statement regarding a solution of two components A and B exhibiting positive deviation from ideal behaviour is :
| 1. | Intermolecular attractive force between A-A and B-B are stronger than those between A-B |
| 2. | ∆mixH = 0 at constant T and P |
| 3. | ∆mixV = 0 at constant T and P |
| 4. | Intermolecular attractive forces between A-A and B-B are equal to those between A-B |
For an ideal solution, the correct option is:
1. at constant T and P
2. at constant T and P
3. at constant T and P
4. at constant T and P
1. \(\Delta H_{\text{Mix}}=0\)
2. \(\Delta U_{\text{Mix}}=0\)
3. \(\Delta P=P_{\text{obs.}}-P_{\text{(Calculated by Raoult's law)}}=0\)
4. \(\Delta G_{\text{Mix}}=0\)
| 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 |
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Q. No.
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