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When an oxide of manganese (A) is fused ...

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

Text Solution

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The available data suggests the compound (A) is `MnO_(2)`. It participates in the following reaction to account for the different products.
` underset("Manganese dioxide (A)")(2MnO_(2))+4KOH+O_(2) overset("Fuse")to underset("(dark green)(B)") underset(" Pot. manganate ")(2K_(2)MnO_(4))+2H_(2)O`
`3MnO_(4)^(2-)+4H^(+) to underset(" Purple (C)") (2MnO_(4)^(-))+MnO_(2)+2H_(2)O`
`overset((A))(2MnO_(4)^(-))+H_(2)O+KO to underset((A))(2MnO_(2))+2OH^(-)+ underset((D))(KIO_(3))`
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