Long Answer TypeGive the comparison between electrovalent and covalent bonds.
| 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. |
Give the comparison between Electrovalent (or ionic compounds) compounds and covalent compounds (special reference to properties).
Discuss the orbtial concept or quantum concept for the formation of covalent bond.
Or
Explain the formation of covalent bond on the basis of valence bond theory.
Short Answer TypeLong Answer TypeDiscuss the orbital shapes of the following covalent molecules:
(i) H2 (ii) F2 (iii) O2 (iv) N2.
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