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By which of the following methods, \( \mathrm{H}_{2} \mathrm{O}_{2} \) can't be synthesised?
(a) Lewis addition of ice cold \( \mathrm{H}_{2} \mathrm{SO}_{4} \) on \( \mathrm{BaO}_{2} \)
\( \mathrm{P} \)
(b) Addition of ice cold \( \mathrm{H}_{2} \mathrm{SO}_{4} \) on \( \mathrm{PbO}_{2} \)
W
(c) Aerial oxidation of 2-ethyl anthraquinol
(d) Electrolysis of \( \left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4} \) at a high current density
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