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Discuss the main postulates of valence b...

Discuss the main postulates of valence bond theory.

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The main postulates of valence bond theory are as follows:
(i) A covalent bond is formed due to the overlapping of the outermost half filled orbitals of the combining atoms.
(ii) the two half filled orbitals involved in the covalent bond formation should contain electrons with opposite spins.
(iii) the completely filled orbitals remain undisturbed.
(iv) the valency of an element is equal to the number of half filled orbitals present in it.
(v) s-orbital does not show any directional characteristic whereas other are directional in nature.
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OMEGA PUBLICATION-CHEMICAL BONDING AND MOLECULAR STRUCTURE -MULTIPLE CHOICE QUESTIONS
  1. Discuss the main postulates of valence bond theory.

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  2. A crystal has highest meltiing point. It is

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  3. Which one of the following has the shortest carbon carbon bond length?

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  4. The percentage of s- character in the hybrid orbitals sp, sp^(2)" and ...

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  5. In the co-ordinate valency

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  6. Which of the following has a net dipole moment?

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  7. Which of the following is diamagnetic?

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  8. In which one of the following sp^2 hybridisation?

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  9. The shape of sulphate ion is

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  10. The bond order for a species with the configuration, sigma1s^(2), sigm...

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  11. Which of the following is paramagnetic?

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  12. Compare the relative stability of the following species and indicate t...

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  13. Which one shows maximum hydrogen bonding?

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  14. The weakest amoung the following types of bonds is

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  15. According to Fajan's rules covalent bonding is favourable by

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  16. The number of pi bonds in structure given are (NC)(2) C=C(CN)2

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  17. Which of the following compound is covalent?

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  18. Antibonding MO is formed by

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  19. In a hononuclear molecules, which of the following set of orbitals is...

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  20. Covalent compounds are soluble in

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  21. Which of the following has the largest de Broglie wavelength (all have...

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