Question

${{H}_{2}}{{O}_{2}}$ is manufactured these days:

• A. by the action of $H _{2} O _{2}$ on $BaO _{2}$
• B. by the action of $H _{2} SO _{4}$ on $Na _{2} O _{2}$
• C. by electrolysis of $50 \% H _{2} SO _{4}$
• D. by burning hydrogen in excess of oxygen

Answer 1

Answer: (C)

by electrolysis of $50 \% H _{2} SO _{4}$

Answer 2

Electrolysis of $50\%$ sulphuric acid is the commercial method for the preparation of hydrogen peroxide. $H_2SO_4 {<=>} H^+ + HSO_4^-$ . At anode : $2HSO_4^- \to H_2S_2O_8 + 2e^-$ $H_2S_2O_8 + 2H_2O \to 2H_2SO_4 + H_2O_2$ At cathode : $2H + 2e^- \to H_2$