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Can a pi- bond be formed without the for...

Can a `pi-` bond be formed without the formation of a `sigma-` bond. How many `sigma - and pi-` bonds are formed in acetylene?

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No, `sigma -` bonds = 3, `pi-` bonds =2
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MODERN PUBLICATION-CHEMICAL BONDING AND MOLECULAR STRUCTURE-Revision Exercises (Objective Questions)(Very Short Answer Questions)
  1. What are the shapes of (i) BF(3) and (ii) NH(3) molecules?

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  2. Which of the two bonds : ionic or covalent is directional?

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  3. Can a pi- bond be formed without the formation of a sigma- bond. How m...

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  4. Draw Lewis structure of O^(2-) and N^(3-) ions.

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  5. Give bond angles in H(2)O, CH(4) and SF(6) molecules.

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  6. Write the favourable factors for the formation of ionic bond.

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  7. Define electric dipole moment. Write its SI unit ?

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  8. How many sigma- and pi- bonds are present in naphthalene?

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  9. Out of NaCl and MgO which has higher lattice energy ?

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  10. What do you understand by bond pairs and lone pairs of electrons? Illu...

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  11. Define electronegativity and dipole moment.

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  12. Give one example each of a tetraatomic molecule which is (i) Polar ...

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  13. Give one example each of a molecule having (i) 6 bond pairs (ii) 7...

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  14. What is the total number of sigma bonds and pi bonds in H(3)C-unders...

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  15. What shapes are associated with sp^(3)d and sp^(3)d^(2) hybrid orbital...

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  16. How is paramagnetic character of a compound related to the number of u...

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  17. Which out of H(2)^(-) and H(2)^(+) is more stable and why?

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  18. Which d - orbitals are involved in sp^(3)d^(2) hybridisation in SF(6)?

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  19. Write the molecular orbital configuration of a molecule having bond or...

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  20. Which out of O(2)^(+) and O(2)^(-) is more stable?

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