Chapter 12, Problem 50A

(a)

Interpretation Introduction

Interpretation:

The molecular structure of given molecule is to be predicted.

Concept introduction:

VSEPR theory helps to draw the molecular shape as:

Total number of valence electron pairs	Number of bond pairs	Number of lone pairs	Geometry and shape
2	2	0	linear
3	3	0	Trigonal planar
	2	1	bent
4	4	0	Tetrahedral
	3	1	Pyramidal
	2	2	Bent

Answer to Problem 50A

The molecular structure of ${\mathrm{H}}_2\mathrm{P}{\mathrm{O}}_4{}^{-}$ is tetrahedral.

Explanation of Solution

Lewis structure of ${\mathrm{H}}_2\mathrm{P}{\mathrm{O}}_4{}^{-}$ is:

  

It shows, there are 4 bond pairs and no lone pairs around phosphorus atom. Therefore, by VSEPR theory its shape is tetrahedral.

(b)

Interpretation Introduction

Interpretation:

The molecular structure of given molecule is to be predicted.

Concept introduction:

VSEPR theory helps to draw the molecular shape as:

Total number of valence electron pairs	Number of bond pairs	Number of lone pairs	Geometry and shape
2	2	0	linear
3	3	0	Trigonal planar
	2	1	bent
4	4	0	Tetrahedral
	3	1	Pyramidal
	2	2	Bent

Answer to Problem 50A

The molecular structure of $\mathrm{C}\mathrm{l}{\mathrm{O}}_4{}^{-}$ is tetrahedral.

Explanation of Solution

Lewis structure of $\mathrm{C}\mathrm{l}{\mathrm{O}}_4{}^{-}$ is:

  

It shows, there are 4 bond pairs and 2no lone-pairs around chlorine atom. Therefore, by VSEPR theory its shape is tetrahedral.

(c)

Interpretation Introduction

Interpretation:

The molecular structure of given molecule is to be predicted.

Concept introduction:

VSEPR theory helps to draw the molecular shape as:

Total number of valence electron pairs	Number of bond pairs	Number of lone pairs	Geometry and shape
2	2	0	linear
3	3	0	Trigonal planar
	2	1	bent
4	4	0	Tetrahedral
	3	1	Pyramidal
	2	2	Bent

Answer to Problem 50A

The molecular structure of $\mathrm{S}{\mathrm{O}}_3{}^{2-}$ is pyramidal.

Explanation of Solution

Lewis structure of $\mathrm{S}{\mathrm{O}}_3{}^{2-}$ is:

  

It shows, there are 3 bond pairs and 1 lone pair around sulphur atom. Therefore, by VSEPR theory its shape is pyramidal.