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Railways PYQCBT 1 2016

RRB NTPC · Question 55

What percentage of nitrogen is in our atmosphere?

  1. 72%

  2. 75%

  3. 78%

  4. 65%

  5. 55%

Show answer & explanation

Answer: (C) 78%

Explanation

Dry air is about 78% nitrogen, 21% oxygen and about 1% argon, with traces of carbon dioxide and other gases.