In which of the following will the corrosion of iron be most rapid ?
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a
In pure water
b
In pure oxygen
c
In air and moisture
d
In air and saline water
answer is D.
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Detailed Solution
2Fe+O2+4H+→Fe+2+2H2O;Eo=1.67 VMoisture in air leads to the formation of H2CO3 or H2SO3 which gives H+ ions that favours corrosion.Saline water also has low pH value which favours corrosion.