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Standard XI

Chemistry

Preparations and Uses of Sodium Carbonate

A Colourless ...

Question

A colourless aqueous solution contains nitrates of two metals, $X$ and $Y$ . When it was added to an aqueous solution of $NaCl,$ a white precipitate was formed. This precipitate was found to be partially soluble in hot water to give a residue $P$ and a solution $Q$ . The residue $P$ was soluble in aqueous ${NH}_{3}$ and also in excess sodium thiosulfate. The hot solution $Q$ gave a yellow precipitate with $KI$ . The metals $X$ and $Y$ , respectively, are:

$Ag and Pb$

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$Ag and Cd$

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$Cd and Pb$

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$Cd and Zn$

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Solution

The correct option is A
$Ag and Pb$

Answer : (A)
$X = {AgNO}_{3}; Y = Pb {({NO}_{3})}_{2_{}}; P = AgCl; Q = {PbCl}_{2} (1) {AgNO}_{3} + NaCl \to AgCl ↓ + {NaNO}_{3} (X) (P) (2) AgCl (s) ↓ 2 {NH}_{3} \to {[Ag {({NH}_{3})}_{2}]}^{+} {Cl}^{-} (P) (Soluble) (3) AgCl + 2 {Na}_{2} S_{2} O_{3} \to {Na}_{3} [(Ag {(S_{2} O_{3})}_{2})] + NaCl (P) (Soluble) (4) Pb {({NO}_{3})}_{2} + 2 NaCl \to {PbCl}_{2} ↓ + 2 {NaNO}_{3} (Y) (White ppt (Q) (Soluble in hot water) (5) {PbCl}_{2} + 2 KI \to {PbCl}_{2} ↓ + 2 KCl (hot solution) (Yellow ppt) (Q) Hence, (A) Ag and Pb is correct option .$

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