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Break-point chlorination is the dose at which

  • A.the chlorine demand of the water is at its highest
  • B.all the added chlorine has been consumed
  • C.the taste and odour of the water are strongest
  • D.free residual chlorine begins to appear

Answer: D

Chlorine first destroys the reducing matter and forms chloramines, whose residual passes through a maximum and then falls to a minimum; beyond that point further chlorine remains free. Dosing beyond it also removes taste and odour.

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