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Question

Which reaction involves neither oxidation nor reduction?

A
CrO24Cr2O27
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B
CrCrCl3
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C
NaNa+
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D
S2O26S4O26
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Solution

The correct option is A CrO24Cr2O27
Oxidation number of Cr in CrO24=x+4×(2)=2

x=6

Oxidation number of Cr in Cr2O27=2x+7×(2)=2

x=6

The oxidation number of Cr does not change. Hence, it undergoes neither oxidation nor reduction.

Hence, the correct option is A

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