Hydrogen And Its Compounds Question 209
Question: Hydrogen peroxide is now generally prepared on industrial scale by the
Options:
A) action of $ H_2SO_4 $ on barium peroxide
B) action of $ H_2SO_4 $ on sodium peroxide
C) electrolysis of 50% $ H_2SO_4 $
D) burning hydrogen in excess of oxygen
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Answer:
Correct Answer: C
Solution:
[c] industrial preparation of $ H_2O_2: $ By the electrolysis of 50% $ H_2SO_4: $ 50% $ H_2SO_4: $ solution is electrolyzed at $ 0{}^\circ $ C between Pt electrodes. The perdisulphuric acid is formed. $ H_2SO_4\rightarrow {H^{+}}+HS{O^{-}}_4 $ At Anode: $ 2HS{O^{-}}_4\to H_2S_2O_8+2e $ At Cathode: $ 2{H^{+}}+2e\to H_2 $ The obtained perdisulphuric acid gives $ H_2O_2 $ on hydrolysis. $ H_2S_2O_8+2H_2O\rightarrow H_2O_2+2H_2SO_4 $ This $ H_2O_2 $ is separated by distillation at reduced pressure and thus, 30% solution of $ H_2O_2 $ is obtained.
BETA
