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Which of the following is not an element?

Answer and explanation

Correct answer: Air

The governing concept is the classification of matter into elements, compounds, and mixtures. An element contains only one kind of atom and cannot be separated into simpler substances by ordinary chemical methods. Sodium, sulfur, and carbon each consist of atoms of one chemical element, so they are elements even though their physical forms differ. Air, however, is a homogeneous mixture of several gases, mainly nitrogen and oxygen, along with smaller amounts of other gases. Its composition can vary, and its components can be separated by physical methods. Therefore, option D is correct; the other three are genuine elements.

Related tags

ChemistryClassification-Of-MatterElements-And-MixturesNature Of MatterSome Basic Concepts Of ChemistryClass 11 Mcq

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