Q.

Which of the following is an Inert Gas?

A. Hydrogen
B. Nitrogen
C. Oxygen
D. Argon
Answer» D. Argon
Explanation: Argon is an inert gas (noble gas) that is placed in Group 18 of the periodic table. It is the most abundant noble gas in Earth's crust, comprising 20.00015% of the crust. Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), and Radon (Rn) are other noble gases that occur naturally.
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