Which gas is known as a compound gas?

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Multiple Choice

Which gas is known as a compound gas?

Explanation:
A compound gas is made from more than one element chemically bound together in a fixed ratio. Ammonia fits this because its formula NH3 shows nitrogen combined with hydrogen in a 1:3 ratio, forming a single molecule made of two different elements. The other gases are elemental in nature: oxygen as O2, nitrogen as N2, and hydrogen as H2, each consisting of only one element. So they are not compounds. Ammonia is the compound gas.

A compound gas is made from more than one element chemically bound together in a fixed ratio. Ammonia fits this because its formula NH3 shows nitrogen combined with hydrogen in a 1:3 ratio, forming a single molecule made of two different elements. The other gases are elemental in nature: oxygen as O2, nitrogen as N2, and hydrogen as H2, each consisting of only one element. So they are not compounds. Ammonia is the compound gas.

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