A water sample has ppm level concentration of the following anions F-=10 ppm, SO4-2 =100 ppm, NO3- = 40 ppm. The anions that makes the water sample unsuitable for drinking is

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Only SO4-2

Only NO3-

Both SO4-2& NO3-

Only F-

answer is D.

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Detailed Solution

Permissible level of ‘F-‘ is 1 ppm – 2 ppm

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