A water sample has ppm level concentration of following anions
`F^(-)=10 , SO_(4)^(2-)=100 , NO_(3)^(-) =50`
the anion/anions that make/makes the water sample unsuitable for drinking is/are

Options

A. Both `SO_4^(2-) and NO_3^(-)`
B. Only `F^-`
C. Only `SO_4^(2-)`
D. Only `NO_3^(-)`

Answer

B

Explanation

Acceptable level
`F^-` upto 1 ppm
`NO_3^(-)` upto 50 ppm
`SO_4^(2-)` upto 500 ppm.