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Q Which of the following is used for purification of water?

A A. Oxygen
B B. Ammonia
C C. Chlorine
D D. Carbon dioxide

PPSC - JUNIOR CLERK (BPS 11) - S&GAD - 2016 Everyday Science MCQs, PPSC Solved Past Papers MCQs,Everyday Science MCQs, JUNIOR CLERK (BPS 11) PUNJAB PUBLIC SERVICE COMMISSION (S&GAD) 2016, PPSC Solved Past Papers MCQs ID: 84152

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