NextMockSearch exams, e.g. SSC CGL, UPPSC, Lekhpal
Railways PYQCBT 1 2016

RRB NTPC · Question 20

The greenhouse gas which is called laughing gas is

  1. Methane
  2. Carbon dioxide
  3. Nitrous oxide
  4. Sulphur dioxide
Show answer & explanation

Answer: (C) Nitrous oxide

Explanation

Nitrous oxide (N₂O) is known as laughing gas, and it is also a greenhouse gas.