Maximum permissible residual chlorine in treated water should be __________ mg/liter.

Q. Maximum permissible residual chlorine in treated water should be __________ mg/liter.

  1. 0.001 to 0.01
  2. 0.2 to 0.3
  3. 2 to 3
  4. 5 to 10

Answer: Option 2

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