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Chemistry Question on Organic Chemistry- Some Basic Principles and Techniques

A metal nitrate reacts with KI to give a black precipitate which on addition of excess of KI convert into orange colour solution. The cation of metal nitrate is

A

Hg2+Hg^{2+}

B

Bi3+Bi^{3+}

C

Sn2+Sn^{2+}

D

Pb2+Pb^{2+}

Answer

Bi3+Bi^{3+}

Explanation

Solution

Bi3++3I−⟶BiI3↓Black→excessI−[BiI4]−Orange\solutionBi^{3+} + 3I^- \longrightarrow \underset{Black}{BiI_3 \downarrow} \xrightarrow[excess] {I^-} \underset{Orange \\\solution}{[BiI_4]^-}