Environmental Chemistry Question 68
Question: Which of the following statements are not
(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.
Options:
A) (ii) and (iv)
B) (ii) and (iii)
C) (ii), (iii) and (iv)
D) (iii) and (iv)
Show Answer
Answer:
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.
BETA
