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State and explain the main postulates of...

State and explain the main postulates of valence bond theory. How does this theory explain the shapes of the following molecules?
` HF ,N_2 ,H_2 S and PH_3`

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ICSE-CHEMICAL BONDING AND MOLECULAR STRUCTURE-ESSAY (LONG ANSWER ) TYPE QUESTIONS
  1. Define resonance and resonance energy. What are the conditions for res...

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  2. State and explain the main postulates of VSEPR theory. How is this the...

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  3. State and explain the main postulates of valence bond theory. How does...

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  4. What do you understand by overlapping of orbitals? Discuss the overlap...

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  5. What do you understand by hybridisation? Explain with examples the var...

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  6. Write the Lewis structures of the following molecules : O3 , SO2 , ...

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  7. What do you understand by partial ionic character in a covalent bond? ...

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  8. Define dipole moment. How is it related to the molecular structure?

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  9. Arrange on the basis of bond angle NO3-, NO2- NO2. and NO2+

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  10. Discuss the shape of the following molecules using the VSEPR m...

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  11. What is hydrogen bonding and what are the conditions which favour its ...

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  12. Describe the salient features of valence bond theory. Explain the form...

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  13. State the salient features of molecular orbital theory.

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  14. Describe molecular orbital. How is it different from an atomic orbital...

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  15. What is LCAO method? How does it lead to the concept of bonding and an...

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  16. What do you understand by an energy level diagram? Show the molecular ...

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  17. What is bond order? How is it obtained from a MO diagram?

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  18. Draw the molecular orbital diagrams of H2, H(2)^(+) and H(2)^(-) and d...

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  19. On the basis of molecular orbital theory, explain why He2 does not exi...

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  20. Draw the molecular orbital diagram of N2 molecule and write its molecu...

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