Q5 / 90 · JEE Main 2016 (03 Apr) · Chemistry

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 high concentration of:

  • Correct answer
    A
    Nitrate
  • B
    Iron
  • C
    Fluoride
  • D
    Lead

Solution

Parameters                           Maximum prescribed concentration in  drinking water                                                                        

Iron                                         0.2 ppm

Fluroide                                  1.5 ppm

Lead                                        50 ppb

Nitrate                                     50 ppm

Hence the concentration of nitrate in a given
water sample exceeds from the upper limit as
given above.
 

Hence, the correct answer is option: 'A'.

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