electrochemistry

Question: The formation of rust on the surface of iron occurs through the reactions

1) $Fe\,(s)\to F{{e}^{2+}}(aq)+2{{e}^{-}}$ at anode

2) ${{O}_{2}}(g)+4{{H}^{+}}(aq)+4{{e}^{-}}\to 2{{H}_{2}}O(l)$ at cathode

3) $4F{{e}^{2+}}(aq)+{{O}_{2}}(g)+4{{H}_{2}}O\,(l)\to 2F{{e}_{2}}{{O}_{3}}(s)+8{{H}^{+}}$

4) All of these

Solution:

Explanation: No Explanation

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