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.
