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Question

Which of the following not represents redox reactions?
I. Cr2O27+2OH2CrO24+H2O
II. Zn+CuSO4ZnSO4+Cu
III. 2MnO4+3Mn2++4OH5MnO2+2H2O
IV. 2CuCu+Cu2+

A
I
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B
I, III
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C
III, IV
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D
II, III, IV
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Solution

The correct option is A I
The redox reactions are given below:
I. Cr2O27+2OH2CrO24+H2O
+6 +6 (no change in oxidation state)
II. Zn+CuSO4ZnSO4+Cu
0 +2 +2 0 (redox reaction)
III. 2MnO4+3Mn2++4OH5MnO2+2H2O
+7 +2 +4 (redox reaction)
IV. 2CuCu+Cu2+
+1 0 +2 (redox reaction)
So, only II, III and IV are redox reactions.

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