Chemistry - Environmental Chemistry Question with Solution | TestHub

Above 500 ppm of$\mathrm{S}{\mathrm{O}}_4^{2-}$ions in drinking water, can cause laxative effect otherwise lesser ppm value is permissible for drinking.
Maximum limit of$\mathrm{N}{\mathrm{O}}_3^{-}$ions in drinking water is 50 ppm, above this limit it can cause the disease like methamoglobinemia.
More than 1 ppm${\mathrm{F}}^{-}$ions in drinking water are not fit for drinking, it can cause decay of bones and teeth.