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Explain why freezing point of a solvent is lowered on dissolving a non-volatile solute into it? Give an important application of the phenomenon of depression in freezing point.

Answer:

When a non-volatile solute is added its vapour pressure is lowered and at a lower temperature, the vapour pressure of solid and liquid solvent will be equal i.e., depression in freezing point takes place. The application of ΔT_fis used as antifreeze so that water does not freeze especially in cold countries.

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What is a semi-permeable membrane?

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(i) Name the process occurring in the above plant.
(ii) To which container does the net flow of solvent take place?
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(iv) Give one potential use of the plant.

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Solutions

Explain why freezing point of a solvent is lowered on dissolving a non-volatile solute into it? Give an important application of the phenomenon of depression in freezing point.