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CSS Solved Papers
Physics Chemistry

Engineering :: Environmental Engineering

  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
[E]. 10 ppm to 20 ppm    

Answer: Option A
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