Question

A water sample has $ppm$ level concentration of following anions:
$F^{-}=10,S{O}_4^{2-}=100,N{O}_3^{-}=50$ The anion/anions that make/makes the water sample unsuitable for drinking is/are:

• A. Both $S{O}_4^{2-}=500ppm$
• B. Only $F^{-}$
• C. Only $S{O}_4^{2-}$
• D. Only $N{O}_3^{-}$

Answer 1

The correct option is B Only $F^{-}$

Permissible limit for $S{O}_4^{2-}=500ppm$
Permissible limit for $N{O}_3^{-}=50ppm$
Permissible limit for $F^{-}=1ppm$