A) only\[NO_{3}^{-}\]
B) both \[SO_{4}^{2-}\]and \[NO_{3}^{-}\]
C) only\[F-\]
D) only \[SO_{4}^{2-}\]
Correct Answer: C
Solution :
\[\text{N}{{\text{O}}_{\text{3}}}^{-}:\]The maximum limit of nitrate in drinking water is 50 ppm. Excess nitrate in drinking water can cause disease. Such as methemoglobinemia. \[SO_{4}^{2-}:\]above 500 ppm of \[S{{O}_{4}}^{2-}\]ion in drinking water causes laxative effect otherwise at moderate levels it is harmless \[{{F}^{-}}:\]Above 2ppm concentration of \[{{F}^{-}}\] in drinking water cause brown mottling of teeth. \[\therefore \]The concentration given in question of \[\text{S}{{\text{O}}_{\text{4}}}^{2-}\]\[\And \,N{{O}_{3}}^{-}\] in water is suitable for drinking but the concentration of \[{{\text{F}}^{-}}\](i.e 10 ppm) make water unsuitable for drinking purpose:
You need to login to perform this action.
You will be redirected in
3 sec
