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# Concentration of chlorine for water purification is

$(a)\;0.2-0.8\;ppm \\ (b)\;0.2-0.4\;ppm \\(c)\;0.8-2.4\;ppm \\ (d)\;0-1\;ppm$

Chlorine is used in India for making water fit for drinking at a concentration of $0.2-0.4\;ppm$.
Many a times, the same substance can act as an antiseptic as well as a disinfectant by changing the concentration of the solution used.
Hence b is the correct answer.