Aqueous solution of \( \mathrm{Na}_{2} \mathrm{SO}_{4} \) containing a small amount of HPh is el...

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Aqueous solution of \( \mathrm{Na}_{2} \mathrm{SO}_{4} \) containing a small amount of HPh is electrolysed using Pt electrdes. The colour of the solution after some time will
(a) Remain colourless
(b) Change from pink to colourless
(c) Change from colourless to pink
(d) Remain pink
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