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Question

Assertion :Addition of HgI2 to KI(aq.) shows an increase in freezing point. Reason: HgI2 (insoluble) reacts with KI(aq.) to form complex K2HgI4 and thus, number of particles present in solution decreases.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Assertion is incorrect but Reason is correct
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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
According to colligative properties, an increase in number of solute will lead to a decrease in freezing point.

When HgI2 is added to aq. KI, number of solute will decrease due to formation of complex. Hence, the freezing point will increase.

So, option A is correct.

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