Question

Which of the following are molecules of compounds?
I) Carbon dioxide​
II) Chlorine​
III) Hydrogen chloride

• A. Only II
• B. I, II, and III
• C. Only I
• D. Both I and III

Answer 1

The correct option is D Both I and III

Carbon dioxide (${\mathrm{CO}}_2$)

• It has one carbon atom and two oxygen atoms.

• Since it is made up of different kinds of atoms, it is a molecule of compound.

Chlorine (${\mathrm{Cl}}_2$)

• It has two chlorine atoms.

• Since it is made up of the same kind of atoms, it is a molecule of element.

Hydrogen chloride (HCl)

• It has one hydrogen atom and one chlorine atom.

Since it is made up of different kinds of atoms, it is a molecule of compound.