Marshalls acid \( \left(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}\right) \) or peroxo disulp...
0Marshalls acid \( \left(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}\right) \) or peroxo disulphuric acid is prepared by the electrolytic oxidation of \( \mathrm{H}_{2} \mathrm{SO}_{4} \) as
\[
2 \mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}+2 \mathrm{H}^{+}+2 \mathrm{e}^{-}
\]
\( \mathrm{O}_{2}(\mathrm{~g}) \) and \( \mathrm{H}_{2}(\mathrm{~g}) \) are obtained as by products. In such electrolysis, \( 4.48 \mathrm{~L} \) of \( \mathrm{H}_{2}(\mathrm{~g}) \) and \( 1.12 \mathrm{~L} \) of \( \mathrm{O}_{2}(\mathrm{~g}) \) were produced at STP. The weight of \( \mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8} \) formed is
(a) \( 9.7 \mathrm{~g} \)
(b) \( 19.4 \mathrm{~g} \)
(c) \( 14.5 \mathrm{~g} \)
(d) \( 29.1 \mathrm{~g} \)
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