Question

A water sample has ppm level concentration of following anionsF⁻ = 10; $SO_4^{2-}$ = 100; $NO_3^-$ = 50the anion/anions that make/makes the water sample unsuitable for drinking is/are :(1) only $NO_3^-$(2) both $SO_4^{2-}$ and $NO_3^-$(3) only F⁻(4) only $SO_4^{2-}$

Answer 1

..................................

Answer 2

Answer:

Only F

Explanation:

NO-3 The maximum limit of nitrate (NO-3) in drinking water is 50 ppm and its source are majorly fertilizers. lf the maximum limit is increased in water it will cause a syndrome known as methemoglobinemia (blue baby syndrome)

SO2-4 The maximum limit of sulphate (SO2-4 ) according to WHO is 500 pm and its major sources are mainly acid rain and the industries. Excess of SO2-4 is seen to have a laxative effect.

F-  The maximum limit of fluoride (F-) is about 1,5 ppm. The higher concentration of fluoride converts enamel to a more harder fluorapatite. Whereas the concentration below > 2ppm causes a brown mottling of teeth and a higher concentration > 10 ppm is harmful for both bones and teeth.

Thus, the SO2-4 at 100 ppm and NO-3 at 50 ppm in water is suitable for drinking but the concentration of F- 10 ppm makes water unsuitable for drinking.