JEE Advanced Chemistry question

When is fused with KOH, a coloured compound formed, the product and its colour is [IIT JEE 2003]

(A), greenCorrect
(B), purple
(C), brown
(D), black

Answer: (A)

Solution

Oxidative alkaline fusion of pyrolusite () with KOH in the presence of air gives potassium manganate: . (Mn in +6 state) is the familiar dark-green compound. (option b) is

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Question ID VK-159575