Question
Give the comparison between electrovalent and covalent bonds.
Solution
| Electrovalent bonds | Covalent bonds |
| 1.Electrovalent compounds are formed by complete transfer of electrons in KCl (K. +.CI: — K+ Cl–) | 1. Covalent compounds are formed by mutual sharing of electrons as in NH3 |
| 2.Electrovalent compounds are made up of ions. | 2.Covalent compounds are made up of molecules. |
| 3.Electrovalent compounds are heard, crystalline solids e.g. NaCl, MgCl2 | 3. Covalent compounds are usually liquids or gases. E.g. CH4, C2H6, NH3 |
| 4. Electrovalent compounds are usually soluble in water but insoluble in non-polar solvents like Cl4 | 4.Covalent compounds are soluble in non-polar solvents like benzene or carbon tetrachloride and in soluble in polar solvents like water. |
| 5. Electrovalent compounds generally have high melting and boiling points. | 5.Covalent compounds generally have low melting and boiling points. |
| 6.Electrovalent compounds are good conductors of electricity in the molten state and in aqueous solutions but insulators in the solid state. |
6. Covalent compounds are bad conductors of electricity. |
