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Q.

A common disinfectant used in village wells is

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a

potassium permanganate

b

iodine and bromine

c

ozone gas

d

free chlorine

answer is A.

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Detailed Solution

Potassium permanganate (KMnO4) is the best disinfectant for village wells (as well as for domestic water storage tanks).
Note: However, it is not effective for all bacteria.

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