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Question

3MnO2+4H+2MnO4+MnO2+2H2O

The reaction is :

A
Combustion
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B
Redox
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C
Double displacement
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D
Disproportionation
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Solution

The correct options are
B Redox
D Disproportionation

The term "redox" comes from two concepts involved in electron transfer: reduction and oxidation.

A disproportionation reaction is a reaction in which a substance is simultaneously oxidized and reduced, giving two different products.

MnO24(VI) is oxidised to MnO4(VII) and reduced to MnO2(IV).
So in the above reaction, both oxidation and reduction were done, so it is redox and disproportionation reaction.

Hence, option B & D are correct.

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