| (i) \[{{F}^{-}}\] ion concentration above 2 ppm causes brown mottling in teeth. |
| (ii) Excessive \[{{F}^{-}}\] (over 10 ppm) causes harmful effect to bones and teeth. |
| (iii) Excessive lead in drinking water causes disease methemoglobinemia |
| (iv) Deficiency of sulphate in drinking water causes laxative effect. |
A) (ii) and (iv)
B) (ii) and (iii)
C) (ii), (iii) and (iv)
D) (iii) and (iv)
Correct Answer: D
Solution :
[d] For statement (iii), Methemoglobinemia (blue baby syndrome) is caused due to excess of nitrate in drinking water. For statement (iv). Excessive sulphate (> 500 ppm) in drinking water causes laxative effect, otherwise at moderate levels it is harmless.
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