1. Tardigrade
  2. Question
  3. Chemistry
  4. A colorless 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 partly soluble in hot water to give a residue P and a solution Q. The residue P was soluble in aq. 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

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Q. A colorless 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 partly soluble in hot water to give a residue $P$ and a solution $Q$. The residue $P$ was soluble in aq. $NH _{3}$ and also in excess sodium thiosulfate. The hot solution $Q$ gave a yellow precipitate with $KI$. The metals $X$ and $Y$, respectively, are

JEE AdvancedJEE Advanced 2020

Solution:

$X=A g, Y=P b$
image
$\underset{(P)}{AgCl} + qa (NH_3) \rightarrow \underset{\text{Soluble}}{[Ag(NH_3)_2]^+}$ $\underset{(Q) \text{hot}}{PbCl_2} 6 KI \rightarrow \underset{\text{Yellow ppt }}{PbI_2}$