QJEEAdv22Ch12cf: JEE Advanced 2022 Chemistry - Class 12 JEEAdv22Ch12cf Solution: The reaction of and in water produces a precipitate that…

Question

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The reaction of

\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}

and

\mathrm{NaCl}

in water produces a precipitate that dissolves upon the addition of

\mathrm{HCl}

of appropriate concentration. The dissolution of the precipitate is due to the formation of

Accepted Answer

\mathrm{Pb}^{2+}

on reaction with

\mathrm{Cl}^{-}

, produces white precipitate of

\mathrm{PbCl}_2

\mathrm{Pb}^{2+}+2 \mathrm{Cl}^{-} \longrightarrow \mathrm{PbCl}_2 \downarrow

(White)

This precipitate is soluble in concentrated hydrochloric acid due to formation of tetrachloroplumbate (II) ion

\mathrm{PbCl}_2 \downarrow+2 \mathrm{Cl}^{-} \longrightarrow\left[\mathrm{PbCl}_4\right]^{2-}

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