ElectrochemistryHard

Question

Choose the correct statement(s).

Options

A.At the anode, the species having minimum reduction potential is formed from the oxidation of corresponding oxidizable species.
B.In highly alkaline medium, the anodic process during the electrolytic process is
     4OH- → O2 + 2H2O + 4e-.
C.The standard potential of Cl- |AgCl| Ag half-cell is related to that of Ag+ | Ag through the expression
    EoAg+|Ag = EoCl-|AgCl|Ag + ln Ksp(AgCl)
D.Compounds of active metals (Zn, Na, Mg) are reducible by H2 whereas those of noble metals (Cu, Ag, Au) are not reducible.

Solution

In highly alkaline medium OH- ion get oxidise in preference to H2O
4OH- → O2 + 2H2O + 4e-
EoCl-/AgCl/Ag = EoAg+/Ag -
EoRed of active metal is lower than EoRed of hydrogen so not reduced by hydrogen.

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