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

( A ) Only $F^-$
( B ) both $SO_4^{2-}$ and $NO_3^-$
( C ) Only $SO_4^{2-}$
( D ) Only $NO_3^-$

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