Q.

A dilute aqueous solution of Na2SO4 is electrolysed using platinum electrodes. The products at the anode and cathode are

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a

O2, H2

b

SO2, Na

c

O2, Na

d

S2O8-2 ;H2

answer is A.

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Detailed Solution

Pt electrodes are inert electrodes and does not under go any chemical change.In aq. solution of Na2SO4 :At Cathode : Discharge potential of H2O < Na+ or SRP of H2O > Na+ H2O undergoes reduction.At Anode : Discharge potential of   ,H2O undergoes oxidation.
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