Which of the following conditions in drinking water causes methemoglobinemia?

Question:
Which of the following conditions in drinking water causes methemoglobinemia?

> $50 \mathrm{ppm}$ of lead
$>50 \mathrm{ppm}$ of chloride
$>50 \mathrm{ppm}$ of nitrate
$>100 \mathrm{ppm}$ of sulphate

Correct Option: , 3

Solution:

Methemoglobinemia is caused by drinking water which is contaminated with nitrate.

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