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Answer:
Correct option is A)
Disproportionation reaction are the reactions in which the same element/compound get oxidized and reduced simultaneously.
Since I and II reactions are as follows
2Cu
+
→Cu
2+
+Cu
0
And
3MnO
4
2−
4H
+
→2MnO
4
−
+MnO
2
+2H
2
O
Other two reactions are correct and belong to comproportionation reaction.
Thus option A is correct.
Explanation:
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