When mercuric iodide is added to an aqueous solution of potassium iodide:

Freezing point is raised

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Freezing point is lowered

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Freezing point does not change

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Boiling point does not change

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Solution

The correct option is A Freezing point is raised

Thus, number of ions decreases in the solution. Hence, depression in freezing point is lowered. i.e., actual freezing point is raised.

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