A) \[C{{O}_{2}}\]
B) \[SO_{4}^{2-}\]
C) \[CO_{3}^{2-}\]
D) \[{{S}^{2-}}\]
Correct Answer: B
Solution :
The laxative effect is observed only when the sulphates present in water have concentration greater than 500 ppm. Otherwise at moderate levels, it is harmless.You need to login to perform this action.
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