Chemistry - Complete d-block Question with Solution | TestHub

Question Explanation:

Matching metals with their reaction products with Nitric acid.

Concept: Redox reactions of metals with ${\mathrm{HNO}}_3$.

Solution:

(P)$2{\mathrm{KMnO}}_4+3\mathrm{HCOOK}\underset{\text{ solution }}{\overset{\text{ alkaline }}{\to }}2{\mathrm{MnO}}_2+{\mathrm{KHCO}}_3+2{\mathrm{K}}_2{\mathrm{CO}}_3+{\mathrm{H}}_2\mathrm{O}$

(Q)$2{\mathrm{MnO}}_4^{-}+2{\mathrm{OH}}^{-}\underset{\text{ solution }}{\overset{\text{ alkaline }}{\to }}2{\mathrm{MnO}}_4^{2-}+{\mathrm{H}}_2\mathrm{O}+\mathrm{O}$

then

$$2{\mathrm{MnO}}_4^{2-}+2{\mathrm{H}}_{2}O\to 2{\mathrm{MnO}}_2^{}+4{\mathrm{OH}}^{-}+2\mathrm{O}$$

(R)$2{\mathrm{KMnO}}_4+{\mathrm{H}}_2\mathrm{O}+\mathrm{KI}\to 2{\mathrm{MnO}}_2+2\mathrm{KOH}+{\mathrm{KIO}}_3$

(S)${\mathrm{MnO}}_4^{\ominus }+{\mathrm{H}}_2{\mathrm{C}}_2{\mathrm{O}}_4+{\mathrm{H}}^{\oplus }\to {\mathrm{Mn}}^{2+}+{\mathrm{CO}}_2+{\mathrm{H}}_2\mathrm{O}$