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(a) A blackish brown coloured solid 'A' ...

(a) A blackish brown coloured solid 'A' when fused with an alkali metal hydroxide in the presence of air, produces a dark green colored compound 'B' which upon electrolytic oxidation in alkaline medium gives a dark purple coloured compound 'C'. Identify A,B and C and write the reactions involved.
(b) What happesn when acidic solution of green compound (B) is allowed to stand for sometime? Give the equation involved. What is this type of reaction called ?

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### Step-by-Step Solution **(a)** 1. **Identify the blackish brown solid 'A':** The blackish brown colored solid 'A' is manganese dioxide (MnO2). 2. **Reaction with alkali metal hydroxide in the presence of air:** ...
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