Dipole Moment

Q.

Why does band gap increase with decrease in size of nanoparticles?

Q. A molecule possessing dipole moment is:

1. $C{H}_4$
2. $H_{2}O$
3. $B{F}_3$
4. $C{O}_2$

Q. The dipole moment of
is 1.5 D. Then dipole moment of this compound will be:

1. 0 D
2. 1.5 D
3. 2.86 D
4. 2.25 D

Q. The molecule $M{X}_3$ has zero dipole moment. The sigma bonding orbitals used by M are:

1. Pure $p$
2. $sp$ hybrids
3. $s{p}^2$ hybrids
4. $s{p}^3$ hybrids

Q. Find out incorrect order of the dipole moment among the following pairs of compound:

1. $N{H}_3>N{F}_3$
2. $\text{p-nitrophenol < o-nitrophenol}$
3. $C{H}_{3}Cl>C{H}_{2}C{l}_2$
4. $Si{F}_4<S{F}_4$

Q. Which among the following molecules is polar?

1. $C{O}_2$
2. $S{O}_2$
3. $BeC{l}_2$
4. 

Q.

Which pair has permanent dipole moment for both the members?

1. $N{O}_2$ and $C{O}_2$

2. $N{O}_2$ and $O_3$

3. $Si{F}_4$ and $C{O}_2$

4. $Si{F}_4$ and $N{O}_2$

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

1. $Si{F}_4$
2. $S{F}_4$
3. $Xe{F}_4$
4. $B{F}_3$

Q. Which of the following is expected to have a dipole moment of zero?

1. $SOC{l}_2$
2. $O{F}_2$
3. $Se{F}_6$
4. $Cl{F}_5$

Q. Which option does not have the correct order of dipole moments?

1. $C{H}_{3}Cl>C{H}_{2}C{l}_2>CHC{l}_3>CC{l}_4$
2. $C{H}_{3}Cl>C{H}_{3}F>C{H}_{3}Br>C{H}_{3}I$
3. $HCl>HF>HBr>HI$
4. 

Q. Which among the following molecules has a permanent dipole moment?

1. $Si{F}_4$
2. $B{F}_3$
3. $P{F}_3$
4. $P{F}_5$

Q. The correct orientations of dipoles in pyrrole and pyridine is:

1. 
2. 
3. 
4. 

Q. Both $B{F}_3$ and $N{F}_3$ are covalent compounds. $B{F}_3$ is non-polar while $N{F}_3$ is polar. The reason is that:

1. Boron is a solid and nitrogen is a gas in free state
2. $B{F}_3$ is planar while $N{F}_3$ is pyramidal in shape
3. Boron is a metalloid while nitrogen is a non-metal
4. Atomic size of Boron is smaller than that of nitrogen

Q. The $H-OH$ bond angle in water is ${105}^o$. The $H-OH$ bond distance being 0.94 $\stackrel{\circ }{\text{A}}$. The dipole moment for the molecule is 1.85 D. Calculate the charge on oxygen atom.
Given: cos ${105}^o$ = $-0.25$

1. $1.617\times {10}^{-10}$ esu
2. $1.617\times {10}^{-10}$ C
3. $1.167\times {10}^{-12}$ esu
4. $1.167\times {10}^{-15}$ esu

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

1. $Si{F}_4$
2. $S{F}_4$
3. $Xe{F}_4$
4. $B{F}_3$

Q.

The order of dipole moment of the above molecules is

1. I > II = III > IV

2. II > I > III > IV

3. II > III > I > IV

4. II > I = III > IV

Q.

The correct order of dipole moment is _____

1. $C{H}_4<N{F}_3<N{H}_3<H_{2}O$

2. $N{F}_3<C{H}_4<N{H}_3<H_{2}O$

3. $N{H}_3<N{F}_3<C{H}_4<H_{2}O$

4. $H_{2}O<N{H}_3<N{F}_3<C{H}_4$

Q. Both $B{F}_3$ and $N{F}_3$ are covalent compounds. $B{F}_3$ is non-polar while $N{F}_3$ is polar. The reason is that:

1. Boron is a solid and nitrogen is a gas in free state
2. $B{F}_3$ is planar while $N{F}_3$ is pyramidal in shape
3. Boron is a metalloid while nitrogen is a non-metal
4. Atomic size of Boron is smaller than that of nitrogen

Q.

[Assertion]:- All molecules with polar bond have non-zero dipole moments

[Reason]:- Dipole moment is a vector quantity

1. if both assertion and reason are correct, and reason is the correct explanation of the assertion.
2. If both assertion and reason are correct, but reason is not the correct explanation of the assertion.
3. If assertion is correct, but reason is incorrect.
4. If assertion is incorrect, but reason is correct.

Q. Which bond angle $\left(\theta \right)$ would result in the maximum dipole moment for the triatomic molecule $X{Y}_2$

1. $\theta$ = ${90}^o$
2. $\theta$ = ${120}^o$
3. $\theta$ = ${150}^o$
4. $\theta$ = ${180}^o$

Q.

Which has higher dipole moment?

1. 

2. 

3. 

4. All three have same dipole moment

Q. Which of the following has the highest dipole moment?

1. $N{H}_3$
2. $P{H}_3$
3. $Sb{H}_3$
4. $As{H}_3$

Q. The correct decreasing order of dipole moments for the given molecules is:
$(B{F}_3,N{F}_3$ and $N{H}_3)$

1. $B{F}_3>N{F}_3>N{H}_3$
2. $N{F}_2>B{F}_3>N{H}_3$
3. $N{H}_3>N{F}_3>B{F}_3$
4. $N{H}_3>B{F}_3>N{F}_3$

Q.

Which among the following compound have non-zero dipole moment?

1. 

2. 

3. 

4. 

Q.

Which has higher dipole moment?

1. 

2. 

3. 

4. All three have same dipole moment

Q. Which of the following molecules is/are polar?

1. $PC{l}_2{F}_3$
2. $Xe{F}_4$
3. $N{O}_2$
4. $O_3$

Q. Which of the following molecules does not possess a permanent dipole moment?

1. $C{S}_2$
2. $S{O}_3^{2-}$
3. $H_{2}S$
4. $S{O}_2$

Q. Find out incorrect order of the dipole moment among the following pairs of compound:

1. $N{H}_3>N{F}_3$
2. $\text{p-nitrophenol < o-nitrophenol}$
3. $C{H}_{3}Cl>C{H}_{2}C{l}_2$
4. $Si{F}_4<S{F}_4$

Q. Which of the following molecules are polar: $O{F}_2,HF,S{O}_3$ ?

1. All except $S{O}_3$
2. Only $HF$
3. Only $HF$ and $O{F}_2$
4. None of these

Q. The dipole moment of H - Br molecule is $2.6\times {10}^{-30}$ coulomb.metre. Its bond length is $1.3\mathring{A}$ Then, the percentage ionic character of H - Br bond is:

1. 20%

2. 16%

3. 21.5%

4. 12.5%