How much gram of chlorine tablet is required to disinfect 20 litres of water?How much gram of chlorine tablet is required to disinfect 20 litres of water?  mcq  given below:

Q. How much gram of chlorine tablet is required to disinfect 20 litres of water?

(a) 0.2 g
(b) 0.3 g
(c) 0.5 g
(d) 1.0 g

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Ans:(c) 0.5 g 
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