Q.

Which one of the following noble gases is not found in the atmosphere?

A. Argon
B. Krypton
C. Radon
D. Xenon
Answer» C. Radon
Explanation: All the noble gases are present in Earth's atmosphere and, except for helium and radon, their major commercial source is the air, from which they are obtained by liquefaction and fractional distillation.
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