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NEET levelSingle correct optionDifficulty 1 of 3qc062

The group reagent for group IV cations ( $Zn X^{2 +}$ , $Mn X^{2 +}$ , $Ni X^{2 +}$ , $Co X^{2 +}$ ) is

A $H X_{2} S$ in presence of dilute $HCl$
B $H X_{2} S$ in presence of $NH X_{4} Cl$ and $NH X_{4} OH$
C $NH X_{4} Cl$ and $NH X_{4} OH$ only
D $(NH X_{4}) X_{2} CO X_{3}$ in ammoniacal medium

Answer: B

Group IV sulphides need a relatively high

[S X^{2 -}]

, so

H X_{2} S

is passed in an ammoniacal medium (in presence of

NH X_{4} Cl

and

NH X_{4} OH

).

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