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Hydrogen
Question
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The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to be 1000 ppb, 40 ppb, 100 ppm and 0.2 ppm, respectively. This water is unsuitable for drinking due to the high concentration of:

  • Lead

  • Nitrate

  • Iron

  • Fluoride

Answer

B.

Nitrate

This water unsuitable for drinking due to the high concentration of nitrate. In drinking water, maximum permissible concentration of 
Lead = 50 ppm
Nitrate = 50 ppm
Iron = 0.2 ppm
Fluoride = 1 ppm

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