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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.

120 Views

Short Answer Type

163.

What do you understand by geometry and shapes of molecules?

111 Views

164.

Why do covalent moleucles have definite geometery?

245 Views

Long Answer Type

165.

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

124 Views

Short Answer Type

166.

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

435 Views

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.

173 Views

Long Answer Type

168.

On the basis of VSEPR theory, discuss the geometry of the following covalent molecules: (i) BeF₂(ii) BF₃(iii) CH₄.

173 Views

169.

With the help of VSEPR theory, explain the shape of: (i) NH₃ (ii) H₂O.

1797 Views

Short Answer Type

170.
Although geometries of NH₃ and H₂O molecules are distorted tetrahedral, the bond angle in water is less than that of ammonia. Discuss.

In NH₃, there are three bond pairs and one lone pair on N-atom. There is only one lone pair on N-atom to repel the bond pairs. In H₂O, there are two bond pairs and two lone pairs on O-atom. There are two lone pairs on O-atom to repel the bond pairs. Hence, the repulsions on bond pairs are greater in H₂O than in NH₃ and hence the bond angle is less.