Discussion
Assertion (A): Hydrogen peroxide has displaced hypochlorite for most cotton bleaching.
Reason (R): Its decomposition products are only water and oxygen, so the effluent carries no chlorinated material.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the decisive advantage. Hypochlorite bleaches effectively but forms adsorbable organic halogens in the effluent and can leave chlorine on the fibre, causing yellowing and damage later. Peroxide decomposes to water and oxygen, so the effluent carries no chlorinated species at all - and that, more than any difference in whiteness, is what displaced hypochlorite.
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