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(D) According to the standards for drinking water: $1$. The concentration of $F^{-}$ should be up to $1 \ ppm$ to $2 \ ppm$. Concentrations above $2 \

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only $F^{-}$

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(D) According to the standards for drinking water: $1$. The concentration of $F^{-}$ should be up to $1 \ ppm$ to $2 \ ppm$. Concentrations above $2 \ ppm$ cause brown mottling of teeth and harmful effects on bones. Here,$[F^{-}] = 10 \ ppm$,which is much higher than the limit. $2$. The concentration of $SO_4^{2-}$ is considered harmful if it exceeds $500 \ ppm$. Here,$[SO_4^{2-}] = 100 \ ppm$,which is within the safe limit. $3$. The concentration of $NO_3^{-}$ is considered harmful if it exceeds $50 \ ppm$. Here,$[NO_3^{-}] = 50 \ ppm$,which is at the threshold limit but generally considered safe. Therefore,only $F^{-}$ makes the water sample unsuitable for drinking.

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

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