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Q.

The oxidation number of Mn in the product of akaline oxidative fusion of MnO2 is:

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answer is 6.

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Detailed Solution

2MnO2+2KOH+O2⟶2K2MnO4+2H2OLet the ox. no. of Mn in K2MnO4 is x.∴ 2×1+x+4×(−2)=0or                       x = +6
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