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Why boiling point of water is increased ...

Why boiling point of water is increased on addition of non-volatile solute into it?

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This is because when a non-volatile solute is added to a volatile liquid solvent, its vapour pressure decreases and it has to be heated to a higher temperature so that its vapour pressure becomes equal to the atmospheric pressure.
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For a non-volatile solute

Assertion (A) When methyl alcohol is added to water, boiling point of water increases. Reason (R ) When a volatile solute is added to a volatile solvent evevation in boiling point is observed.

Explain in why on addition of 1 moe of NaCl to 1L of water, the boiling point of water increases, while addition of 1 mole of methyl alcohol to 1 L of water decreases its boilbing point .

STATEMENT-1 : For solution of volatile liquids, the partial vapour pressure of each component in the solution is directly proportional to its mole fraction. STATEMENT-2 : Always there will be lowering of vapour pressure on addition of non-volatile solute to a solvent. STATEMENT-3 : If there is dissociation of non-volatile then the V.P. of solution increases.

MBD -HARYANA BOARD-SOLUTIONS-VSATQ ( VERY SHORT ANSWER TYPE QUESTIONS )
  1. State Raoult's law for solution containing non-volatile solute.

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  2. Define Colligative property.

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  3. Define molal elevation constant.

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  4. Why is osmotic pressure considered as a colligative property ?

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  5. Why boiling point of water is increased on addition of non-volatile so...

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  6. Discuss the role of molecular interaction in a solution of alcohol and...

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  7. What is the nature of the solution when ethyl alcohol and water are mi...

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  8. What is azeotropic solution ? Give an example of maximum boiling azeot...

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  9. Define azeotropic mixture.

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  10. What will be nature of the solution when chloroform and acetone are mi...

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  11. Why is the vapour pressure of solution of glucose in water lower than ...

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  12. Why is boiling point of the solution gets raised when a non-volatile s...

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  13. Name the method for determining the osmotic pressure of a solution.

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  14. Why is osmotic pressure considered as a colligative property ?

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  15. Out of the various methods for determining the molar mass of the solut...

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  16. Out of 1M BaCl2 and 1M Al2(SO4)3, which will have more osmotic pressur...

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  17. What happens to freezing point of water if ethylene glycol is added to...

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  18. Define molal elevation constant.

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  19. What are the units of the molal depression constant for water?

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  20. Define molal depression constant. How is it related to enthalpy of fus...

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