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NEET levelSingle correct optionDifficulty 1 of 3qc111

Which reagent is used as the group reagent for Group V cations ( $Ba X^{2 +}$ , $Sr X^{2 +}$ , $Ca X^{2 +}$ )?

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

Answer: C

Group V cations are precipitated as their carbonates

BaCO X_{3}

,

SrCO X_{3}

and

CaCO X_{3}

. The reagent is ammonium carbonate in a medium buffered with

NH X_{4} Cl

and

NH X_{4} OH

.

H X_{2} S

/HCl is for group II,

NH X_{4} OH

/

NH X_{4} Cl

for group III and

Na X_{2} HPO X_{4}

is a test for

Mg X^{2 +}

(group VI).

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