Mathematics of Dipole Moment

Q. A diatomic molecule has dipole moment of 1.2 D. If the bond distance is $1.0\stackrel{\circ }{A}$, what fraction of charge e exists on each atom?

1. 1

2. 0.5

3. 0.25

4. 0.125

Q. Ortho-chloro phenol is less polar than O-fluoro phenol. Why?

1. Intra molecular H-bonding

2. Inter molecular Hydrogen bonding

3. Size of Cl as compared to size of F

4. Cl is a gas

Q.

The maximum number of compounds that have the same net dipole moment is? The dipole moment $\mu$ of $C-Cl$ = 1.5D

(1) $Ph-Cl$

(2)(3)

(4)(5)(6)

1. 1

2. 2

3. 4

4. 3

Q.

The values of EN of A and B are 1.2 and 4.0 respectively. $\%$ ionic character in bond A - B is

1. 

2. 

3. 

4. 

Q.

Calculate % ionic character in HCl.

$Bondlength=1.275\stackrel{\circ }{A},{\mu }_{observed}=1.03D$

1. 

2. 

3. 

4. 

Q. If the observed dipole moment of HF is 1.944 D and the bond length of HF is 90 pm. Find the $\%$ covalent character of HF.

Q. Assume that in $CH{X}_3$, only the CX bond is polar and it has $20\%$ ionic character. Also, $CH{X}_3$ is a perfect tetrahedral i.e. $\angle HCX=\angle XCX={109}^{\circ }{28}^{{}^{\prime }}$. If the C-H bond length is 150 pm, then find dipole moment (in Debye) of $CH{X}_3$.(Given:$cos(180-{109}^{\circ }{28}^{{}^{\prime }})=\frac{1}{3}$) .

Q. Calculate the fractional charge on Bromine atom in HBr. Given dipole moment of HBr = 0.78 D, bond distance of HBr = $1.41\stackrel{\circ }{A}$, electronic charge e = $4.8\times {10}^{-10}$ e.s.u

1. $+0.11$
2. $-0.11$
3. $-0.22$
4. $+0.22$

Q. Which of the following has a zero dipole moment?

1. $C{O}_2$
2. $N{H}_3$
3. $N{F}_3$
4. $H_{2}O$

Q. If the dipole moment of AB molecule is given by 2.4 D and A-B the bond length is 1 A then % covalent character of the bond is: