Question

Assertion : Assertion : In the third group of qualitative analysis, $NH _4 Cl$ is added to $NH _4 OH$ medium.
Reason : This is to convert the ions of group into their respective chlorides.

• A. If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
• B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
• C. If the Assertion is correct but Reason is incorrect.
• D. If the Assertion is incorrect and Reason is correct.

Answer 1

Answer: (C)

$NH _4 Cl$ suppresses the ionisation of $NH _4 OH$ due to common ion effect and concentration of $OH ^{-}$ions is just sufficient to precipitate third group radicals as hydroxide. IV group hydroxides, having high $K_{s p}$, are not precipitated.