Question

Which amongst the following gases can be classified as compound?

• A. Hydrogen chloride
• B. Chlorine
• C. Oxygen
• D. Nitrogen

Answer 1

The correct option is A Hydrogen chloride

Compounds are made up of two or more kinds of atoms, chemically combined, in a definite ratio. Here, hydrogen chloride ($\text{HCl}$) is formed by chemical combination of hydrogen and chlorine in the ratio 1:1, hence it is a compound.

Molecules are made up of only one kind of atoms. Since, oxygen $\left({\text{O}}_2\right)$, nitrogen $\left({\text{N}}_2\right)$, and chlorine $\left({\text{Cl}}_2\right)$ are made of only one type of atoms. Hence, they are classified as molecules.