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JEE Main levelSingle correct optionDifficulty 2 of 3qc127

Assertion (A): The test for $NH X_{4} X^{+}$ must be carried out with a portion of the original solution. Reason (R): Ammonium salts are added as reagents in the group III and group V separations. Choose the correct option.

ABoth A and R are true but R is not the correct explanation of A
BA is true but R is false
CBoth A and R are true and R is the correct explanation of A
DA is false but R is true

Answer: C

A is true, and the reason is exactly that

NH X_{4} Cl

,

NH X_{4} OH

and

(NH X_{4}) X_{2} CO X_{3}

are added during the scheme, so

NH X_{4} X^{+}

would be present in later filtrates regardless of the sample. Hence R is true and explains A.

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