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NEET levelSingle correct optionDifficulty 1 of 3ev121

Detergents that produce a persistent foam in rivers and lakes are those having:

  1. Aonly sodium chloride as the active ingredient
  2. Bhighly branched hydrocarbon chains, which bacteria cannot degrade easily
  3. Cunbranched hydrocarbon chains, which bacteria degrade rapidly
  4. Dno hydrocarbon chain at all

Answer: B

Branched-chain (hard) detergents resist biodegradation and cause persistent foam. Unbranched-chain (soft) detergents are biodegradable.
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