The lightest gas on earth is ?

Hydrogen

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Oxygen

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Helium

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Chlorine

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Solution

The correct option is A Hydrogen
Answer:- (A) Hydrogen
Explanation:-
Hydrogen, most abundant in the universe, is the chemical element with atomic number 1, and an atomic mass of $1.00794$ amu, the lightest of all known elements. It exists as a diatomic gas $(H_{2})$ . Hydrogen is the most abundant gas in the universe.

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