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Q.

Which of the following reaction is preferred at anode during the electrolysis of H2SO4 at higher concentration?

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a

2H2O(l)⟶O2(g)+4H+(aq)+4e−

b

2SO42−(aq)⟶S2O82−(aq)+2e−

c

Both (a) and (b)

d

None of these

answer is B.

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Detailed Solution

During the electrolysis of  H2SO4 (dilute)    2H2O(l)⟶O2(g)+4H+(aq)+4e−;EcellO=1.23VDuring the electrolysis of conc. H2SO42SO42−(aq)⟶S2O82−(aq)+2e−;Ecell∘=1.96V
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Which of the following reaction is preferred at anode during the electrolysis of H2SO4 at higher concentration?