At 25C and pH 7, a solution containing compound A and its reduced form AH2 has standard electrode potential of -0.6 V. A solution containing B and BH2 has a standard potential of -0.16 V. If a cell were constructed with these systems as half cell, (i) Is AH2 oxidized by B or BH2 oxidized by A under standard conditions? (ii) What is the reversible emf of the cell? (iii) What would be the effect of pH on the equilibrium ratio [B][AH2]/[A][BH2]?

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