Q. Amount of bleaching powder used for disinfection of well is –
A. 2.5 gm for 500 ml of water
B. 5 gm for 500 ml of water
C. 2.5 gm for 1000 L of water
D. 5 gm for 1000L of water
Answer: 2.5 gm for 1000 L of water
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