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Why is freezing point depressed when a n...

Why is freezing point depressed when a non-volatile solute is added to a solvent ?

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Freezing point is the temperature at which the liquid and solid states of a substance have the same vapour pressure. On adding solute to the solvent, vapour pressure is lowered. Therefore, temperature at which the vapour pressure of solid and liquid phases are equal, is also lowered. Therefore, freezing point is depressed.
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ICSE-SOLUTIONS-EXERCISE (PART-II Descriptive Questions) (VERY SHORT ANSWER QUESTIONS)
  1. Give an example of nearly ideal solution.

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  2. Why is boiling point of a solvent elevated upon the addition of a non...

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  3. Why is freezing point depressed when a non-volatile solute is added t...

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  4. What is an antifreeze?

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  5. Define molal elevation constant or ebullioscopic constant.

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  6. Define cryoscopic constant.

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  7. Why is osmotic pressure considered as colligative property?

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  8. What are isotonic solutions ?

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  9. Hypotonic and Hypertonic solution

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  10. Why NaCl solution freezes at lower temperature than water but boils a...

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  11. Why does molality of a solution remains unchanged with change in temp...

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  12. Why is the cooking temperature in pressure cooker higher than that in...

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  13. Solution A is obtained by dissolving 1 g of urea in 100 g of water an...

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  14. Which of the following solutions shows positive deviation from Raoult'...

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  15. When is the value of van't Hoff factor more than one?

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  16. Give one example each when van't Hoff factor is 2 and (1)/(2).

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  17. How is that the boiling points of the following solutions in water ar...

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  18. Mention a large scale use of the phenomenona of reverse osmosis.

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  19. What is the sum of mole fractions of all the components in a three-co...

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  20. State Raoult's law for a solution of volatile liquids.

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