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JIPMER 2009
Exam
JIPMER
Year
2009
Subject
Chemistry
Chapter
p Block Elements (Group 15, 16, 17 & 18)

JIPMER 2009 · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Which of the following is not correct regarding the elecolytic...

Which of the following is not correct regarding the elecolytic preparation of H2O2\mathrm{H}_2 \mathrm{O}_2 ?

Options

  1. ALead is used as cathode
  2. B50%H2SO450 \% \mathrm{H}_2 \mathrm{SO}_4 is used
  3. CHydrogen is liberated at anode
  4. DSulphuric acid undergoes oxidation

Correct answer

C. Hydrogen is liberated at anode

Step-by-step solution

H2O2\mathrm{H}_2 \mathrm{O}_2 can be prepared by electrolysis of 50%H2SO450 \% \mathrm{H}_2 \mathrm{SO}_4. In this method, hydrogen is liberated at cathode. H2SO4⇌2H++2HSO4−\mathrm{H}_2 \mathrm{SO}_4 \rightleftharpoons 2 \mathrm{H}^{+}+2 \mathrm{HSO}_4^{-} At anode : 2HSO4−⟶H2 S2O8+2e−H2 S2O8+2H2O⟶2H2SO4+H2O2 At cathode :2H++2e−⟶H2↑\begin{aligned} & \text{ At anode : } 2 \mathrm{HSO}_4^{-} \longrightarrow \mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8+2 e^{-} \\ & \mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8+2 \mathrm{H}_2 \mathrm{O} \longrightarrow 2 \mathrm{H}_2 \mathrm{SO}_4+\mathrm{H}_2 \mathrm{O}_2 \\ & \text{ At cathode }: 2 \mathrm{H}^{+}+2 e^{-} \longrightarrow \mathrm{H}_2 \uparrow\end{aligned}$$
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