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Which of the following statements is not...

Which of the following statements is not correct ?

A

1. Lighter gases diffuse faster than heavier gases.

B

2. The volume of a gas always increases when the temperature increases.

C

3. Molecules of different gases have the same average kinetic energy at given temperature

D

4. Hydrogen molecules diffuse faster in a vacuum than in air

Text Solution

Verified by Experts

The correct Answer is:
B
This is true only when pressure is constant
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MODERN PUBLICATION-STATES OF MATTER-MULTIPLE CHOICE QUESTIONS (LEVEL-II)
  1. Which of the following statements is not correct ?

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  2. When an ideal gas expands in vacuum, no cooling is observed because th...

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  3. A bottle of dry ammonia and a bottle of dry hydrogen chloride connecte...

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  4. The root mean square speed of gas molecules

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  5. For H(2) gas, the compressibility factor, Z = pV //nRT is :

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  6. Which of the following is not heavier than dry air ?

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  7. Which of the following gas laws is applicable to steam distillation ?

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  8. Absolute zero is the temperature at which

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  9. The root mean square speeds at STP for the gases H(2). N(2). O(2) and ...

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  10. The atomic weights of carbon, nitrogen and oxygen are 12,14 and 16 res...

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  11. When an ideal gas undergoes unrestrained expansion, no cooling occurs ...

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  12. A gas occupies a volume of 250 ml at 700 mm Hg pressure and 25^(@)C . ...

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  13. Two sample of gases A and B are at the same temperature. The molecules...

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  14. The molar volume of methane , CH(4). At 819^(@)C and 760mm pressure is...

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  15. A vessel is filled with a mixture of oxygen and nitrogen . At what rat...

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  16. The relative rates of diffusion of sulphur dioxide ( molar mass = 64) ...

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  17. The number of molecules of an ideal gas in a 4.1 L container at 760 to...

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  18. What volume of air will be expelled from a vessel containing 600 ml a...

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  19. When we heat a gas sample from 27°C to 327°C. then the initial average...

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  20. The volume of a gas measured at 27^(@)C and 1 atm pressure is 10L. Wha...

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