# The unit of van der Waals' constant 'a' is: 1. atm litre2 mol-2                        2. dyne cm4 mol-2 3. newton m4 mol-2                      4. All of the above

Subtopic:  van der Waal’s Correction |
67%
From NCERT
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The unit of van der Waals' constant 'b' is :

1. cm3 mol-1

2. litre mol-1

3. m3 mol-1

4. All of these

Subtopic:  van der Waal’s Correction |
80%
From NCERT
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At STP, 0.50-mole H2 gas and 1.0 mole He gas

1. have equal average kinetic energies

2. have equal molecular speeds

3. occupy equal volumes

4. have equal effusion rates

Subtopic:  Kinetic Theory of Gas |
56%
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The beans are cooked in pressure cooker, because -

1. Boiling point increases with increasing pressure

2. Boiling point decreases with increasing pressure

3. Extra pressure of pressure cooker softens the beans

4. Internal energy is not lost while cooking in pressure cooker

Subtopic:  Gas Laws |
54%
From NCERT
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An ideal gas cannot be liquified because

1. its critical temperature is always above 0$°$C

2. its molecules are relatively smaller in size

3. it solidifies before becoming a liquid

4. forces operating between its molecules are negligible

Subtopic:  Ideal Gas Law |
72%
From NCERT
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The compressibility factor for H2 and He is usually:

1. >1

2. =1

3. <1

4. either of these

Subtopic:  Compressibility Factor |
67%
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Boyle's law is applicable in :

1. Isobaric process

2. Isochoric process

3. Isothermal process

Subtopic:  Gas Laws |
85%
From NCERT
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The temperature of the gas is raised from 27$°$C to 927$°$C the root mean square velocity is

1. $\sqrt{\frac{927}{27}}$ times of the earlier value

2. same as before

3. halved

4. doubled

Subtopic:  Molecular Velocity |
58%
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At lower temperature, all gases except H2 and He show:

1. Negative deviation

2. Positive deviation

3. Positive and negative deviation

4. None of the above

Subtopic:  van der Waal’s Correction |
65%
From NCERT
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500 mL of nitrogen at 27$°$C are cooled to -5$°$C at the same pressure. The new volume becomes-

1. 326.32 mL

2. 446.66 mL

3. 546.32 mL

4. 771.56 mL

Subtopic:  Gas Laws |
82%
From NCERT
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