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  • When an oxide of manganese (A) is fused with KOH in the presence of an oxidizing agent and dissolved in water, it gives a dark green solution of compound (B). Compound (B) disproportionates in neutral or acidic solution to give purple compound (C).

When an oxide of manganese (A) is fused with KOH in the presence of an oxidizing agent and dissolved in water, it gives a dark green solution of compound (B). Compound (B) disproportionates in neutral or acidic solution to give purple compound (C). An alkaline solution of compound (C) oxidises potassium iodide solution to a compound (D) and compound (A) is also formed. Identify compounds A to D and also explain the reactions involved.

Answers (1)

The compounds (i), (ii), (iii) and (iv) are given as under:

A=MnO_{2}\; \; \; \; \; \; B=K_{2}MnO_{4}\; \; \; \; \; \; C=KMnO_{4}\; \; \; \; \; \; \; \; D=KIO_{3}

                                2MnO_{2}\; (A)+4KOH+O_{2}\rightarrow 2K_{2} MnO_{4} (B)+2H_{2} O

                                      3MnO_{4}^{2-}+4H^{+}\rightarrow 2MnO _{4}^{-}+MnO_{2}+2H_{2} O

                               2MnO_{4}^{-}+H_{2} O+KI\rightarrow 2MnO_{2} (i)+2OH^{-}+KIO_{3} (iv).

 

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