Assertion :Addition of $H g I_{2}$ to $K I (a q .)$ shows an increase in freezing point. Reason: $H g I_{2}$ (insoluble) reacts with $K I (a q .)$ to form complex $K_{2} H g I_{4}$ and thus, number of particles present in solution decreases.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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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 $H g I_{2}$ is added to aq. $K I$ , 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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Choose the correct option.

Assertion (A) Addition reaction of water to but-1-ene in acidic medium yields butan-1-ol.
Reason (R) Addition of water in acidic medium proceeds through the formation of primary carbocation.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
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(d) Assertion is wrong statement but reason is correct statement.
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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.

Assertion :Addition of $H g I_{2}$ to $K I (a q .)$ shows an increase in freezing point. Reason: $H g I_{2}$ (insoluble) reacts with $K I (a q .)$ to form complex $K_{2} H g I_{4}$ and thus, number of particles present in solution decreases.