Discussion
According to WHO, maximum permissible level of chlorides in drinking water is
Answer: C
The maximum permissible level of chlorides in drinking water according to the WHO international standards is 600 mg/L, the figure in the 1971 standards, in which the highest desirable level was 200 mg/L. The values 100 mg/L and 200 mg/L are below the permissible limit and belong with the desirable range, and 800 mg/L exceeds the limit. Chloride mainly affects taste, making the water salty, so the limit is set by acceptability rather than by toxicity.
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