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When MnO2 undergoes alkaline oxidative fusion, it is converted into a manganate salt. What is the oxidation number of Mn in the product formed during this process?

1. +4
2. +6
3. +7
4. +3

Correct answer: +6

Solution

Alkaline oxidative fusion converts MnO2 to potassium manganate (K2MnO4). In K2MnO4, the oxidation number of Mn is +6, since 2(+1) + x + 4(-2) = 0 gives x = +6.

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