M

Mr. Dubey • 100.64K Points
Coach

Q. To keep the water safe against pathogenetic bacteria the residual chlorine should remain between

  • (A) 0.05 to 0.2 ppm
  • (B) 0.2 to 0.8 ppm
  • (C) 1 ppm to 2 ppm
  • (D) 6 ppm to 10 ppm
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