Q.

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.
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In which of the following will the corrosion of iron be most rapid ?