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Q.

In which of the following pairs the precipitate are red and black coloured respectively and both precipitates are soluble in excess KI solution?

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a

${HgI}_{2}, {Hg}_{2} I_{2}$

b

${HgI}_{2}, {BiI}_{3}$

c

${CdI}_{2}, {PbI}_{2}$

d

${Cu}_{2} I_{2}, AgI$

answer is B.

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Detailed Solution

$\begin{aligned} {HgI}_{2} \overset{KI}{⟶} K_{2} {HgI}_{4} \\ {BiI}_{3} \overset{KI}{⟶} K [{BiI}_{4}] \end{aligned}$

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