Question

Assertion: A is very dilute acidic solution of $C{d}^{2+}$ and $N{i}^{2+}$ gives a yellow precipitate of CdS on passing hydrogen sulphide.
Reason: Solubility product of CdS is more than that of 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. Assertion is incorrect but Reason is correct
• E. Both Assertion and Reason are incorrect

Answer 1

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

A is very dilute acidic solution of $C{d}^{2+}$ and $N{i}^{2+}$ gives yellow precipitate of $CdS$ on passing hydrogen sulphide because solubility product of $CdS$ is less than that of $NiS$.

Nickel(II) sulfide

$NiS:3\times {10}^{–19}$

Cadmium sulfide

$CdS:8\times {10}^{–28}$