Q. Which of the following are forms of dissolved nitrogen found in groundwater?
1.Nitrate (NO₃⁻)
2.Ammonium (NH₄⁺)
3.Ammonia (NH₃)
4.Nitrite (NO₂⁻)
5.Nitrogen dioxide (NO₂)
Select the correct answer using the code given below:

[A] 1, 2 and 3 only

[B] 1, 2, 3 and 4 only

[C] 1, 3, 4 and 5 only

[D] 1, 2, 3, 4 and 5

Answer: B
Notes:

Explanation:

  • Forms of dissolved nitrogen in groundwater include nitrate (NO₃⁻), ammonium (NH₄⁺), ammonia (NH₃), nitrite (NO₂⁻), nitrogen gas (N₂), nitrous oxide (N₂O), and organic nitrogen.
  • Nitrogen dioxide (NO₂) is a gaseous air pollutant, not typically a dissolved nitrogen form in groundwater.

Source: Environment (N.C.E.R.T)

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