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Q.

Which of the following statements are not correct?
(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.

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a

(ii) and (iv)

b

(ii) and (iii)

c

(ii), (iii) and (iv)

d

(iii) and (iv)

answer is D.

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Detailed Solution

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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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