Q: Which one among the following statements for the gases mentioned below is not correct?
(a)Hydrogen has 3 isotopes.
(b)Helium is a commonly used gas in electric bulbs.
(c)Oxygen is used to burn fuel in rocket engines in spacecraft.
(d)Nitrogen can be used in gaseous form to replace air in food packaging.
Correct Answer: (b)
The correct answer is (d): Sandy soil. Subject: Geography | Sub-topic: Economic & Mineral Geography