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WBCS Preliminary Examination 2020 — General Studies · Question 119 of 200

Q119
General ScienceChemistry
Which one is a fertiliser?
  1. a.N2
  2. b.O2
  3. c.P4
  4. d.NaNO3

Answer: (D) NaNO3

Sodium nitrate (NaNO3) supplies plant-available nitrogen and is used as a fertiliser, unlike the elemental gases N2, O2 and P4.

Q118 Whole paperQ120