Which of the following conditions in drinking water causes methemoglobinemia?

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

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

Correct Option: , 4

Solution:

Concentration of nitrate $>50 \mathrm{ppm}$ in drinking water causes methemoglobinemia

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