UPSC CDS II 2024 GK Paper

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Question : 16 of 120

Marks: +1, -0

Which one among the following statements for the gases mentioned below is not correct?

Hydrogen has 3 isotopes.
Helium is a commonly used gas in electric bulbs.
Oxygen is used to burn fuel in rocket engines in spacecraft.
Nitrogen can be used in gaseous form to replace air in food packaging.

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