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NEET levelSingle correct optionDifficulty 1 of 3qc001

Which reagent is used as the group reagent to precipitate the group I cations (such as $Ag X^{+}$ and $Pb X^{2 +}$ ) from the original solution?

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

Answer: C

Group I cations form insoluble chlorides (

AgCl

,

Hg X_{2} Cl X_{2}

,

PbCl X_{2}

) with chloride ions. Hence cold dilute

HCl

is the group reagent. The other three reagents belong to groups II, III and V respectively.

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