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(C) According to the World Health Organization $(WHO)$ and Indian standards for drinking water,the maximum permissible concentration of fluoride $(F^-

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only $F^-$

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(C) According to the World Health Organization $(WHO)$ and Indian standards for drinking water,the maximum permissible concentration of fluoride $(F^-)$ is $1.0 \; ppm$. Concentrations above $2 \; ppm$ cause fluorosis (brown mottling of teeth). The maximum permissible limit for nitrate $(NO_3^-)$ is $50 \; ppm$. Since the given concentration is $50 \; ppm$,it is at the threshold limit and generally considered acceptable. The maximum permissible limit for sulphate $(SO_4^{2-})$ is $500 \; ppm$. Since the given concentration is $100 \; ppm$,it is well within the safe limit. Therefore,only fluoride $(F^-)$ at $10 \; ppm$ makes the water unsuitable for drinking.

$A$ water sample has $ppm$ level concentration of following anions:
$F^- = 10; \, SO_4^{2-} = 100; \, NO_3^- = 50$
The anion/anions that make/makes the water sample unsuitable for drinking is/are:

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$A$ water sample has $ppm$ level concentration of following anions:$F^- = 10; \, SO_4^{2-} = 100; \, NO_3^- = 50$The anion/anions that make/makes the water sample unsuitable for drinking is/are: