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The ‘blue baby’ syndrome results from

1. methaemoglobin
2. excess of dissolved oxygen
3. excess of TDS (total dissolved solids)
4. excess of nitrate

Correct answer: excess of nitrate

Solution

Excess nitrate in drinking water can cause methemoglobinemia in infants, where hemoglobin is converted to methemoglobin and cannot carry oxygen effectively. This leads to the characteristic bluish discoloration known as blue baby syndrome.

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