Assertion :Statement-I : $N H_{4} C l$ is added in $I I I$ group basic radicals to suppress the ionisation of $N H_{4} O H$ .
Reason: Statement-II: In the presence of a high concentration of $O H^{-}$ ions, basic radicals of other groups will also get precipitated in $I I I$ group.

Read the above assertion and reason and choose the correct option regarding it.

Statement-I is true, Statement-II is true ; Statement-II is correct explanation for Statement-I.

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Statement-I is true, Statement-II is true ; Statement-II is NOT a correct explanation for Statement-I.

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Statement-I is true, Statement-II is false.

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Statement-I is false, Statement-II is true.

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Solution

The correct option is A Statement-I is true, Statement-II is true ; Statement-II is correct explanation for Statement-I.
$N H_{4} C l$ is added in $I I I$ group basic radicals to suppress the ionisation of $N H_{4} O H$ because in the presence of high concentration of $O H^{-}$ ions, basic radicals of other groups will also get precipitated in $I I I$ group.
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