A water sample has ppm level concentration of following anions

Question:

A water sample has ppm level concentration of following anions $\mathrm{F}^{-}=10 ; \mathrm{SO}_{4}^{2-}=100 ; \quad \mathrm{NO}_{3}^{-}=50$ the anion/anions that make / makes the water sample unsuitable for drinking is / are :

  1. only $\mathrm{NO}_{3}^{-}$

  2. both $\mathrm{SO}_{4}^{2-}$ and $\mathrm{NO}_{3}^{-}$

  3. only $\mathrm{F}^{-}$

  4. only $\mathrm{SO}_{4}^{2-}$

Correct Option: , 3

Solution:

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