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Which one is the lightest gas?

A. Ammonia (NH3)
B. Nitrogen (N2)
C. Carbon Dioxide (CO2)
D. Hydrogen (H2)

Answer & Solution
Option: D
Explanation :Hydrogen and helium, the lightest two gases, weigh so little that helium balloons and hydrogen dirigibles are able to float in the atmosphere. Hydrogen is a diatomic gas, and helium is a monatomic gas. Both hydrogen and helium are lighter than air.
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