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Why are hydrogen and helium not liquefie...

Why are hydrogen and helium not liquefied at room temperature?

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MODERN PUBLICATION-STATES OF MATTER : GASES AND LIQUIDS-Revision Exercises (Objective Questions)(Very Short Answer Questions)
  1. What is the ratio of root mean square speed and most probable speed?

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  2. Why a liquid boils at a lower tempetature at the top of a mountain tha...

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  3. Define critical temperature.

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  4. Arrange the following liquids in the increasing order of their normal ...

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  5. Liquids like ether and acetone are kept in cool places.

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  6. Why are hydrogen and helium not liquefied at room temperature?

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  7. Warm water evaporates faster than cold water. Explain.

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  8. Why cooling is caused by evaporation?

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  9. What is compressibility factor ? What is its value for an ideal gas?

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  10. A rubber balloon permeable to hydrogen in all its isotopic forms is fi...

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  11. What would be the SI unit for the quantity pV^(2)T^(2)//n?

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  12. In terms of Charles' law, explain why -273^(@)C is the lowest possible...

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  13. What is meant by supercritial fluid?

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  14. The critical temperatures of carbon dioxide and methane are 31.1^(@)C ...

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  15. What happens when a liquid a heated to the critical temperature of its...

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  16. Why a liquid boils at a lower tempetature at the top of a mountain tha...

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  17. What is the SI unit of coefficient of viscosity? How is it related to ...

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  18. What is the equation of state for real gases ?

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  19. Name the universal gas constant. What is its value in SI unit ?

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  20. What is the effect of temperature on surface tension and viscosity?

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