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JEEMAIN and NEET
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Chemistry
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Chemistry in everyday life
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Q)
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 $
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