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List - I List - II
A) ${NO}_{3}^{-}$ ion in drinking water is greater than 50 ppm causes 1) Dissolved oxygen decreases
B) ${SO}_{4}^{- 2}$ ion is greater than 550ppm causes 2) Minamita disease
C) Mercury poison causing 3) Laxative effect
D) Domestic sewage 4) Blue baby syndrome

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A - 1, B - 2, C - 3, D - 4.

A - 4, B - 3, C - 1, D -2.

A - 3, B - 4, C - 2, D - 1.

A - 4, B -3, C - 2, D - 1.

answer is D.

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Detailed Solution

Excess nitrate (over 50 ppm) in drinking water can cause disease such as
methemoglobinemia (‘blue baby’ syndrome).
Excessive sulphate (>500 ppm) in drinking water causes laxative effect, otherwise at moderate levels it is harmless.
Domestic sewage decreases the dissolved oxygen content in water.
Methyl Mercury poisoning in water leads to Minamita disease.

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