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NEET levelSingle correct optionDifficulty 1 of 3qc202

The group reagent used to precipitate group V cations ( $Ba X^{2 +}$ , $Sr X^{2 +}$ , $Ca X^{2 +}$ ) as carbonates is

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

Answer: D

Ammonium carbonate in an ammoniacal,

NH X_{4} Cl

-containing medium precipitates

BaCO X_{3}

,

SrCO X_{3}

and

CaCO X_{3}

as white solids;

Mg X^{2 +}

remains for group VI.

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