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Explain why : Both BF3 and NH3 are the...

Explain why :
Both `BF_3 and NH_3` are the molecules of the type `AB_3` but their dipole moments are not equal.

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ICSE-CHEMICAL BONDING AND MOLECULAR STRUCTURE-ESSAY (LONG ANSWER ) TYPE QUESTIONS
  1. Define dipole moment. How is it related to the molecular structure?

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  2. Explain why : The dipole moment of CO2 is zero although it contains ...

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  3. Explain why : Both BF3 and NH3 are the molecules of the type AB3 but...

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  4. Explain why : dipole moment of H2 O is much higher than that of H2 S...

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  5. What is the molarity of 1N H2SO4 solution?

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  6. What do you understand by variable electrovalency? Give atleast two ex...

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  7. What do you understand by covalency?The maximum covalency is equal to ...

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  8. Compare the important properties of ionic and covalent compounds.

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  9. Give some examples which illustrate the failure of the octet rule. Wha...

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

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  11. When does an ionic bond develop a partial covalent character?

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  12. What do you understand by polarisation? State and explain Fajan's rule...

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  13. Define resonance and resonance energy. What are the conditions for res...

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

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

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

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

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

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

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

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