JEE MainChemistryp Block Elements (Group 15, 16, 17 & 18)

During the electrolysis of a concentrated aqueous solution of sulphuric acid, the primary product obtained at the anode is:

Options

AO ₂
BH ₂ S ₂ O ₈
CSO ₂
DH ₂

Correct answer

B. H ₂ S ₂ O ₈

Step-by-step solution

During the electrolysis of concentrated sulphuric acid, the bisulphate ions are oxidized at the anode to form peroxodisulphuric acid. At anode: 2 HSO ₄⁻ H ₂ S ₂ O ₈ + 2 e ⁻ Note: If dilute sulphuric acid is used, water is oxidized to release oxygen gas ( O ₂ ) at the anode instead. Answer: H ₂ S ₂ O ₈

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