Heptane and octane form an ideal solution. At 373 K, the vapour pressures of the two liquid components are 105.2 kPa and 46.8 kPa respectively. The vapour pressure of a mixture of 26.0 g of heptane and 35 g of octane would be:
1. 43.45 kPa
2. 78.96 Pa
3. 73.43 kPa
4. 65.72 Pa
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe mass of a non-volatile solute (molar mass 40 g mol–1) that should be dissolved in 114 g octane to reduce its vapour pressure to 80 % would be:
1. 6 g
2. 7 g
3. 8 g
4. 10 g
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyBenzene and toluene form an ideal solution over the entire range of composition. The vapour pressure of pure benzene and toluene at 300 K are 50.71 mm Hg and 32.06 mm Hg respectively.
The mole fraction of benzene in vapour phase, if 80 g of benzene is mixed with 100 g of toluene, would be:
1. 0.41
2. 0.68
3. 0.72
4. 0.59
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology100 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 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe type of molecular interactions in a solution of alcohol and water is:
1. | Electrostatic interaction | 2. | London dispersion forces |
3. | Hydrogen bonding | 4. | Ion-dipole interaction |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology