Question

Out of the following substances, which is an example of a compound?

• A. $O_2$
• B. $C{O}_2$
• C. $Ag$
• D. $Au$

Answer 1

The correct option is B $C{O}_2$

A compound is a pure substance that is formed when the atoms of two or more different elements combine chemically in definite ratio.​

In the given options, Ag and Au represents atoms of silver and gold respectively. They are pure substances which exist as individual elements. Similarly, $O_2$ represents a molecule of oxygen gas, which is a made of two oxygen atoms.

However, $C{O}_2$ is a combination of one carbon and two oxygen atoms, in a definite ratio. Hence, it is a compound.