UPSC Prelims · 1983 · GS Paper I · Q76
In a remote Indian village with a scarcity of fuel, the people draw water from a well. They should be advised before drinking that water to
- (A)Boil it
- (B)Use ion exchange resins
- (C)Use solar stills for distilling
- (D)Use potassium permanganate for purifying the water
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- Subject
- History