Question 66

Q66Multiple choice

When an oxide of manganese

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(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 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.