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AIIMS 2016

Exam: AIIMS
Year: 2016
Subject: Chemistry
Chapter: d and f Block Elements

AIIMS 2016 · Chemistry · d and f Block Elements

Best reagent for the conversion of AgNO_3 to Ag is

Best reagent for the conversion of

\mathrm{AgNO}_3

to

\mathrm{Ag}

is

Options

A $\mathrm{HClO}_4$
B $\mathrm{H}_3 \mathrm{PO}_2$
C $\mathrm{HIO}_4$
D $\mathrm{I}_2$

Correct answer

B. $\mathrm{H}_3 \mathrm{PO}_2$

Step-by-step solution

\mathrm{H}_3 \mathrm{PO}_2 is a good reducing agent as it contains two \mathrm{P}-\mathrm{H} bonds

and

thus reduces

\begin{aligned} & \mathrm{AgNO}_3 \text{ to Ag. } \\ & 4 \mathrm{AgNO}_3+\mathrm{H}_3 \mathrm{PO}_2+2 \mathrm{H}_2 \mathrm{O} \longrightarrow 4 \mathrm{Ag} \downarrow+\mathrm{H}_3 \mathrm{PO}_4 \\ & +4 \mathrm{HNO}_3 \\ & \end{aligned}

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