Question

which of the following is not an example of a pure substance. a} oxygen b} air c}copper d} carbon dioxide ​

Answer 1

Answer:

Air

Explanation:

It consist of nitrogen, argon and other various gases.

Answer 2

The one which is not an example of pure substance from the given options is Air (option b).

• A pure substance is one that contains just atoms or molecules of a single element in its composition.
• Because they only include atoms of a single element, copper, oxygen, and carbon dioxide are pure substances.
• Because air contains a mixture of gases, it is not called a pure substance.
• Different gases, such as nitrogen, ocygen, carbon dioxide, argon, and others, are present in different amounts in the air.
• As a result, the air isn't a pure substance.