Question

Assertion: Due to common ion effect, the solubility of $Hg{I}_2$ is expected to be less in an aqueous solution of KI than in water. But $Hg{I}_2$ dissolves in an aqueous solution of KI to form a clear solution.
Reason: $I^{⊝}$ ion is highly polarisable.

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

Answer 1

Answer: (B)

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

Due to common ion effect, the solubility of $Hg{I}_2$ is expected to be less in an aqueous solution of KI than in water as
$Hg{I}_2+KI⟶K_2\left[Hg{I}_4\right]$.
since $I^{⊝}$ ion is large sized and therefore is highly polarisable.
But (R) is not the correct explanation of (A)