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Q.

A metal nitrate reacts with $KI$ solution to give yellow precipitate which on addition of excess of more concentrated solution (6M) of $KI$ dissolves forming a solution, The cation of metal nitrate is:

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a

${Hg}_{2}^{2 +}$

b

${Ag}^{+}$

c

${Pb}^{2 +}$

d

${Cu}^{2 +}$

answer is C.

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Detailed Solution

$Pb {({NO}_{3})}_{2} \overset{KI}{⟶} \underset{(Yellow)}{{PbI}_{2}} \to_{Excess}^{KI (> 6 M)} \underset{(Soluble)}{{[{PbI}_{4}]}^{2 -}} Dilution ↵$

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