Which of the following gas is lightest?

Dihydrogen

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Helium

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Dinitrogen

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Dioxygen

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Solution

The correct option is A Dihydrogen
Dihydrogen $(H_{2})$ is the lightest gas as it is having two atoms of hydrogen, its molecular weight would be approximately $2$ . And remaining atoms are having more than two I.e., $4, 28, 32$ for $H e, N_{2}, O_{2}$ respectively.

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