Which one of the following reactions is not an example of redox reaction
A
Cl2+2H2O+SO2→4H++SO2−4+2Cl−
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B
Cu+++Zn→Zn+++Cu
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C
2H2+O2→2H2O
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D
HCl+H2O→H3O++Cl−
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Solution
The correct option is DHCl+H2O→H3O++Cl− In reaction HCl+H2O→H3O++Cl−, there is no reduction or oxidation happening! Just ionisation, look at this carefully.