In the reaction of iron with copper sulphate solution:
CuS`"O"_{4}` + Fe ---> Cu + FeS`"O"_{4}`
| Option | Metal | Gas Evolved |
| (i) | Fe | Fe |
| (ii) | Fe | CuS`”O”_{4}` |
| (iii) | Cu | Fe |
| (iv) | CuS`”O”_{4}` | Fe |
| Option | Metal | Gas Evolved |
| (i) | Fe | Fe |
Substance which is oxidized, reduces the other substance. Hence, substance oxidized is itself a reducing agent

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