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Question

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

A
+1 to +3
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B
+2 to +4
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C
+3 to +5
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D
+4 to +6
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Solution

The correct option is D +4 to +6
Oxidation state of Mn in (MnO2) is +4 and Oxidation state of Mn in (K2MnO4) is +6.

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