Which of the following reactions does not involve the change in oxidat

1.	Which of the following reactions does not involve the change in oxidation state of metal?
Answer» `VO^(-2) rarr V_(2)O_3` `K rarr K^(+)` `CU^(2+) rarr CUS ` `Cu^(2+) rarr Cu` Solution :In `Cu^(2+) rarr CuS , Cu ` is in +2 oxidation state in both reactant and product.

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