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A gas used as a disinfectant in drinking water is

  • A.Hydrogen
  • B.Oxygen
  • C.Fluorine
  • D.Chlorine

Answer: D

Chlorine is used to disinfect drinking water. Added as a gas or as bleaching powder, it forms hypochlorous acid, which destroys bacteria and viruses.

A small residual concentration is left in the supply so that the water stays protected all the way through the distribution pipes.

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