In the preparation of KMnO4, pyrolusite (MnO2) is first converted to potassium magnate (K2MnO4). In this conversion, the oxidation state of manganese changes from

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In the preparation of KMnO₄, pyrolusite (MnO₂) is first converted to potassium magnate (K₂MnO₄). In this conversion, the oxidation state of manganese changes from

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+1 to +3

+2 to +4

+3 to +5

+4 to +6

answer is D.

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Detailed Solution

Pyrolusite (MnO₂) is initially transformed to potassium manganate in the production of KMnO₄ (K₂MnO₄). Mn oxidation state shifts from (A) +4 to +6 during this conversion.

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