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Oxygen gas is an example of what?

Answer and explanation

Correct answer: Element

The governing concept is the chemical classification of matter, which is separate from its physical state. Oxygen gas exists mainly as O₂ molecules. Each molecule contains two atoms, but both atoms are of the same element, oxygen. A substance made of only one kind of atom is an element, so oxygen is correctly classified as an element even though it occurs as a diatomic molecule. It is not a compound because a compound must contain atoms of at least two different elements chemically combined in a fixed ratio, as in H₂O. It is not a mixture because a mixture contains more than one substance with variable composition. An alloy is generally a solid mixture involving metals. Therefore option A is correct.

Related tags

OxygenElementCompound Versus MixtureNature Of MatterChemical ClassificationSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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