A highly concentrated solution of potassium sulphate in water is electrolysed using inert electrodes. The products at the cathode and anode are respectively.

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$H_{2}, O_{2}$

$O_{2}, H_{2}$

$O_{2}, K$

$H_{2}, S_{2} {O_{8}}^{2 -}$

answer is D.

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Detailed Solution

$\begin{array}{l} ∵ {E^{0}}_{K^{+} | K} < {E^{0}}_{H^{+} | H_{2}} \\ {E^{0}}_{H_{2} O | O_{2}} < {E^{0}}_{S {O_{4}}^{- 2} {| S_{2} O}_{8}^{- 2}} \\ (h i g h c o n c e n t r a t e s o l u t i o n) \end{array}$

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