Correct Answer - B
Peroxodisulphate, obtained by electrolytic oxidation of acidifed sulphate solutions at high current density, on hydrolysis yields hydrogen peroxide.
`2HSO_(4)^(-)overset("Electrolysis")rarrHO_(3)SOOSO_(3)H(aq)overset("Hydrolysis")rarr2HSO_(4)^(-)(aq)+2H^(+)(aq)+H_(2)O_(2)(aq)`