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What is the signification of 'a' in the van der Waal's equation ?

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DINESH PUBLICATION-STATES OF MATTER : GASES AND LIQUIDS-Very Short Answer Questions
  1. Under what conditions to gases show maximum deviations from ideal gas ...

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  2. Out of CO(2) and N(2) which will deviate more from the ideal gas behev...

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  3. What is the signification of 'a' in the van der Waal's equation ?

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  4. Write the units of van der Waals' constant 'a' and 'b'.

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  5. Why liquids have a definite volume but no definite shape?

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  6. Why liquids diffuse slowly as compared to gases?

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  7. EVAPORATION

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  8. Why cooling is caused by evaporation?

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  9. Which will evaporation faster, water or alcohol ?

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  10. Define molar heat of vaporsation.

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  11. Why has water higher vapour pressure than mercury ?

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  12. What is the nature of equilibrium between the liquid surface and its v...

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  13. Why does water boil at a lower temperature in Nainital than in Delhi.

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  14. Define normal boiling point of a liquid.

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  15. What is the effect of temperature on the surface tension of a liquid ...

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  16. Out of glycerine and water, which more viscous ?

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  17. How does the rate of evaporation of a liquid depend on (i) temperatu...

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  18. Explain why cooking is faster in a pressure cooker.

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  19. Give the main points of distinction between boiling and evaporation.

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  20. Define surface tension. Out of water and ethyl alcohol, which has hig...

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