( O ) Pyrolusite KOH + O 2 Fused (green salt) ( X ) O 3 ( Y ) H 2 O / H + C 2 H 5 OH Pink solution ( Z ) Select oxidation number of metal which is observed in O, X, Y, Z : -

Question

( O ) Pyrolusite ​ KOH + O 2 ​ Fused ​ (green salt) ( X ) ​ O 3 ​ ​ ( Y ) H 2 ​ O / H + C 2 ​ H 5 ​ OH ​ Pink solution ( Z ) ​ Select oxidation number of metal which is observed in O, X, Y, Z : -

TestHub · Accepted Answer

Pyrolusite (O) = MnO₂, so oxidation state of Mn = +4.

Fusion with KOH and O₂ gives K₂MnO₄ (green salt, X), where Mn = +6, so (B) is incorrect.

Oxidation of manganate gives KMnO₄ (Y), where Mn = +7, so (C) is incorrect.

Acidified KMnO₄ is reduced by ethanol to Mn²⁺ (pink solution, Z), so oxidation state = +2.

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