Electrolysis of X gives Y at anode. Vacuum distillation of Y gives H ₂ O ₂ . The number of peroxy (O-O) bonds present in X and Y respectively are :

Step-by-step solution

A 30 % solution of hydrogen peroxide can be obtained by the electrolysis of 50 % sulphuric acid followed by vacuum distillation. The first product of electrolysis is perdisulphuric acid ( H ₂ ~S ₂ O ₈ ) which reacts with water during distillation to form H ₂ O ₂ . 2 H ₂ SO ₄ 2 H ⁺+2 HSO ₄⁻2 HSO ₄⁻ H ₂ ~S ₂ O ₈+2 e⁻ (At anode) H ₂ ~S ₂ O ₈+2 H ₂ O 2 H ₂ SO ₄+ H ₂ O ₂ ' X ' is H ₂ SO ₄ and ' Y ' is H ₂ ~S ₂ O ₈ . So ' X ' and ' Y ' contains zero and one peroxy bond respectively.