A dilute aqueous solution of \( \mathrm{Na}_{2} \mathrm{SO}_{4} \) ...

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A dilute aqueous solution of \( \mathrm{Na}_{2} \mathrm{SO}_{4} \) is electrolysed using Platinum electrodes. The products at the anode and cathode are
(A) \( \mathrm{O}_{2}, \mathrm{H}_{2} \)
(B) \( \mathrm{S}_{2} \mathrm{O}_{8}^{2-}, \mathrm{Na} \)
(C) \( \mathrm{O}_{2}, \mathrm{Na} \)
(D) \( \mathrm{S}_{2} \mathrm{O}_{8}^{2-}, \mathrm{H}_{2} \)
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