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Q.

The lightest gas is:

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a

nitrogen

b

helium

c

oxygen

d

hydrogen

answer is D.

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Detailed Solution

Hydrogen is the lightest gas.

Hydrogen is the element having a single proton in its nucleus. The main isotope has no neutrons (deuterium has one neutron, tritium has two). As a result, it is the lightest element since it contains just one proton and one electron.

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The lightest gas is: