Question

Assertion :A very dilute acidic solution of ${Cd}^{2+}$ and ${Ni}^{2+}$ gives yellow precipitate of $CdS$on passing hydrogen sulphide. Reason: Solubility product of $CdS$ is more than that if $NiS$.

• 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. Both Assertion and Reason are incorrect

Answer 1

The correct option is C Assertion is correct but Reason is incorrect

$C{d}^{+2}+N{i}^{+2}+H_{2}S\to CdS+2H^{+}$

A very dilute acidic solution of $C{d}^{2+}$ and $N{i}^{2+}$ gives yellow precipitate of CdS on passing hydrogen sulphide.This is due to $C{d}^{+2}$ is more reactive than $N{i}^{+2}$.

So Assertion is correct but Reason is incorrect.

Hence option C is correct.