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Chemical Bonding and Molecular Structure

Long Answer Type

161.

Explain coordinate bond by the orbital concept.

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162.

Differentiate between a covalent bond and co-ordinate bond.

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Short Answer Type

163.

What do you understand by geometry and shapes of molecules?

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164.

Why do covalent moleucles have definite geometery?

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Long Answer Type

165.

Name the theory responsible for the definite geometry of covalent molecules. Give main features of the theory ?

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Short Answer Type

166.

What do you mean by Regular geometry and Irregular or Distorted geometry?

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167.
How will you explain the following order of the repulsive interactions between pair of electrons on the central atom:
Lone pair - Lone pair > Lone pair - Bond pair > Bond pair - Bond pair.

The lone pair are localised on the central atom, each bonded pair is shared between two atoms. As a result, the lone pair electrons in a molecule occupy more space as compared to the bonding pairs of electrons. This result in greater repulsion between the lone pairs of electrons as compared to the Lone pair -bond pair and bond pair-bond pair repulsion.

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