Which of the following permissible limits for pollutants in drinking water are correctly stated? (i) Sulphate — less than 500 ppm (ii) Fluoride — 1 ppm (iii) Nitrate — 50 ppm (iv) Lead — 50 ppm

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(iii). (i) Sulphate < 500 ppm is slightly higher than the BIS maximum of 400 ppm; borderline. (ii) Fluoride = 1 ppm matches BIS desirable limit (max 1.5 ppm). (iii) Nitrate = 50 ppm matches the commonly cited WHO limit (45-50 mg/L). (iv) Lead = 50 ppm is completely wrong — lead limit is 0.05 mg/L = 0.05 ppm, not 50 ppm. The most clearly and unambiguously correct statement is (iii); (iv) is unambiguously wrong.

Which of the following permissible limits for pollutants in drinking water are correctly stated? (i) Sulphate — less than 500 ppm (ii) Fluoride — 1 ppm (iii) Nitrate — 50 ppm (iv) Lead — 50 ppm

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