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NEET2009Chemistryp Block Elements (Group 15, 16, 17 & 18)Actual

Which of the following is not correct regarding the elecolytic preparation of H ₂ O ₂ ?

Options

  1. ALead is used as cathode
  2. B50 % H ₂ 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

H ₂ O ₂ can be prepared by electrolysis of 50 % H ₂ SO ₄ . In this method, hydrogen is liberated at cathode. H ₂ SO ₄ 2 H ⁺+2 HSO ₄⁻ aligned & At anode : 2 HSO ₄⁻ H ₂ ~S ₂ O ₈+2 e⁻ & H ₂ ~S ₂ O ₈+2 H ₂ O 2 H ₂ SO ₄+ H ₂ O ₂ & At cathode : 2 H ⁺+2 e⁻ H ₂ aligned

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