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Question

Standard electrode potential:
Fe2++2eFe; E0=0.44 V
Fe3++eFe2+; E0=0.77 V

When an iron electrode is dipped in Fe2+ and Fe3+ aqueous solution to form a half cell, then

A
Fe2+ concentration will increases in solution
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B
Fe3+ concentration will decreases in solution
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C
Fe2+ and Fe3+ concentration reamins unchanged in solution
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D
Fe2+ concentration will decreases in solution
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Solution

The correct option is B Fe3+ concentration will decreases in solution
Standard reduction potential of Fe2+/Fe is less than Fe3+/Fe2+ couple.
Hence, Fe will get oxidised to Fe2+ ions and Fe3+ ions will get reduced to Fe2+.
Hence, both reaction will result in increase of Fe2+ concentration in the solution.
Since, Fe3+ is getting reduced to Fe2+ ions, Fe3+ concentration will decrease in the solution.

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