Question

A sample of water is found to contain \(\mathrm{F^-}\) (1 ppm), \(\mathrm{SO_4^{2-}}\) (>500 ppm), \(\mathrm{NO_3^-}\) (40 ppm). Which ion(s) make(s) the water sample unfit for drinking?

• A. \(\mathrm{F^-}\) & amp; \(\mathrm{NO_3^-}\)
• B. \(\mathrm{SO_4^{2-}}\)
• C. \(\mathrm{NO_3^-}\)
• D. \(\mathrm{F^-}\)

Hint:

High sulphate concentration \[ \boxed{(>500\ \text{ppm})} \] can make drinking water unsuitable, whereas \[ \boxed{ \mathrm{F^-}=1\ \text{ppm} } \] and \[ \boxed{ \mathrm{NO_3^-}=40\ \text{ppm} } \] are within acceptable limits.

Answer 1

The Correct Option is B