Noble gases or inert gases are so named because they are highly unreactive and do not form compounds under normal conditions. Which of these is not an inert gas?
A
Xenon
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B
Radon
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C
Oganesson
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D
Zirconium
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Solution
The correct option is A Zirconium
An inert gas is a gas that does not usually react chemically with other things. They are the most stable elements as they have maximum number of valence electrons in their outer shell.
Examples of inert gases are Argon, Neon, Xenon and Helium. They are often used in welding and sealing.