Question

Name any two substances which contains only

1. Molecules

2. Ions

3. both ions as well as molecules

Answer 1

1. All the ionic compounds contains ions and all the covalent compounds contain molecules. But there are some compound which contains ions as well as molecule.
The substance which contains only molecules are : Methane (CH₄) and Carbon dioxide CO₂
2. The substance which contains ions only are : NaCl, KCl
​3. The substance which contains ion as well as molecule : Na₂CO₃.10 H₂O( ions are Na⁺ and CO₃^2- and molecule is H₂O), CuSO₄.5H₂O (( ions are Cu²⁺ and SO₄^2- and molecule is H₂O)​