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Question

In corrosion of iron :


A
an electrochemical reaction (galvanic cell) is formed in which Fe acts as anode and cathode is where O2 is reduced
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B
electrons flow from anode to cathode through the metal while ions flow through the waterdroplets
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C
dissolved O2 oxidises Fe2+ to Fe3+before it is deposited as rust (Fe2O3.H2O)
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D
all of the above take place
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Solution

The correct option is D all of the above take place
The corrosion of iron is an electrochemical process.
The anode region and cathode region are present on iron.
Iron(II) is oxidized to Iron(II) by oxygen and is then converted to rust. At the cathode, oxygen is reduced.
The electron flow is from anode to cathode through metal.
This is accompanied by the flow of ions through water droplets.

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