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p Block Elements

Section: Chemistry

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Question : 15 of 62

Marks: +1, -0

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.

\mathrm{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 Adv 2020 P1]

Ag and Pb
Ag and Cd
Cd and Pb
Cd and Zn

Solution:

X = Ag, Y = Pb

\underset{\text{(P)}}{\mathrm{AgCl}} + \mathrm{aq} (\mathrm{NH}_3) \xrightarrow[\text{Soluble}]{[\mathrm{Ag}(\mathrm{NH}_3)_2]^+}

\underset{\text{(Q)hot}}{\mathrm{PbCl}_2} + \mathrm{KI} \xrightarrow{} \underset{\text{Yellow ppt}}{\mathrm{PbI}_2}

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