When mercuric iodide is added to an aqueous solution of $K I$ then:

boiling point increase

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boiling point decrease

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freezing point increase

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osmotic pressure increase

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Solution

The correct option is C freezing point increase
Freezing point of the solution will increase
$H g I_{2} + 2 K I ⟶ K_{2} [H g I_{4}]$
This association will decrease the number of ions. As a result Vant Hoff factor (i) will decrease. Now freezing point depression $Δ T = i K_{f} m$
As depression is decreased, freezing point is increased.

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