Assertion: According to the principle of common ion effect, the solubility of $H g C l_{2}$ is expected to be less in an aqueous solution of $K I$ than in water. $H g I_{2}$ dissolves in an aqueous solution of $K I$ to form a clear solution.
Reason: Iodide ion, $I^{-}$ is highly polarizable.

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

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

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Assertion is correct but Reason is not correct

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Assertion is not correct but Reason is correct

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Both Assertion and Reason are not correct

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion
The strong electrolyte KI completely dissociates to provide the common ion iodide ion. This shifts the solubility equilibrium of $H g I_{2}$ from right to left and decreases its solubility.
When $H g I_{2}$ is added to the solution of KI in water, precipitation will occur only if the product of the equilibrium concentrations of the constituent ions is more than the solubility product. A clear solution will be obtained as long as the product of the equilibrium concentrations of the constituent ions is less than the solubility product.

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Similar questions

Q. Assertion: Due to common ion effect, the solubility of

H g I_{2}

is expected to be less in an aqueous solution of KI than in water. But

H g I_{2}

dissolves in an aqueous solution of KI to form a clear solution.
Reason:

I^{⊝}

ion is highly polarisable.

Assertion (A) Ethanol is a weaker acid than phenol.
Reason (R) Sodium ethoxide may be prepared by the reaction of ethanol with aqueous NaOH.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Q. Assertion
If BOD level of water in reservoir is less than 5 ppm it is not polluted.

Reason
High biological oxygen demand means low activity of bacteria in water.

Assertion (A) o-nitrophenol is less soluble in water than the m- and p-isomers.
Reason (R) m and p-nitrophenols exist as associated molecules.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Assertion (A) p-nitrophenol is more acidic than phenol.
Reason (R) Nitro group helps in the stabilisation of the phenoxide ion by dispersal of negative charge due to resonance.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

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Assertion: According to the principle of common ion effect, the solubility of HgCl2 is expected to be less in an aqueous solution of KI than in water. HgI2 dissolves in an aqueous solution of KI to form a clear solution.Reason: Iodide ion, I− is highly polarizable.

Assertion: According to the principle of common ion effect, the solubility of $H g C l_{2}$ is expected to be less in an aqueous solution of $K I$ than in water. $H g I_{2}$ dissolves in an aqueous solution of $K I$ to form a clear solution.
Reason: Iodide ion, $I^{-}$ is highly polarizable.