Previous year MCQs

General science UPPSC 2005 GS-I
Question

Which one of the following Noble Gases is not present in air?

Answer & Solution

Answer: (Detailed Solution Below)

Option C: Radon

Detailed Solution:

The correct answer is “Radon”.
Radon is the noble gas that is not present in the Earth's atmosphere. Radon is radioactive and is produced by the decay of radium-226, which is found in uranium ores.

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