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A 1 M solution of H₂SO₄ is electrolysed. Select correct statement in respect of products obtained at anode and cathode respectively:
Given : $2 {SO}_{4}^{2 -} ⟶ S_{2} O_{8}^{2 -} + 2 e^{-}; E^{\circ} = - 2 .01 V$
$H_{2} O (l) ⟶ 2 H^{+} (aq) + 1 / 2 O_{2} (g) + 2 e^{-}; E^{\circ} = - 1 .23 V$

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$concentration of H_{2} {SO}_{4} remain constant; H_{2}, O_{2}$

$concentration of H_{2} {SO}_{4} decreases; O_{2}, H_{2}$

$concentration of H_{2} {SO}_{4} increases; O_{2}, H_{2}$

$concentration of H_{2} {SO}_{4} remains constant; S_{2} O_{8}^{2 -}, H_{2}$

answer is B.

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Detailed Solution

$E_{{SO}_{4}^{2 -} ∣ S_{2} O_{8}^{2 -}} < E_{H_{2} {OO}_{2}}$

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