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Dipole Moment

Dipole Moment

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Q. An element

X

(Atomic weight = 80 g/mol) has a

f c c

structure. Calculate the number of unit cells in

8 g

of

X

$0.4 \times N_{4}$
$0.25 \times N_{A}$
$4 \times N_{A}$
$0.025 \times N_{A}$

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Q. The correct decreasing order of dipole moments for the given molecules is:

(B F_{3}, N F_{3}

and

N H_{3})

$B F_{3} > N F_{3} > N H_{3}$
$N F_{2} > B F_{3} > N H_{3}$
$N H_{3} > N F_{3} > B F_{3}$
$N H_{3} > B F_{3} > N F_{3}$

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Q.

What is the SI unit of dipole moment?

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

$N H_{3}$
$P H_{3}$
$A s H_{3}$
$S b H_{3}$

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Q.

If the AB₄ molecule is a polar molecule, a possible geometry of AB₄ is:

Square planar
Tetrahedral
Square pyramidal
Rectangular planar

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Q.

What are polar and non polar covalent compounds?

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Q.

What is the IUPAC name of ${CH}_{3} COCl$ ?

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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:

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

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Q.

What is the structure of ${IF}_{7}$ ?

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Q.

Which of the following will have a meso isomer also.

2-hydroxypropanoic acid
2, 3-dichlorobutane
2, 3-dichloropentane
2-chlorobutane

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Q.

If B–Cl bond has a dipole moment, explain why $B C l_{3}$ molecule has zero dipole moment.

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Q.

Among the following the maximum covalent character is shown by the compound

A) FeCl₂. B) SnCl_2.C) AlCl₃. D) MgCl_2.

Explain in detail.

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Q.

Explain why $B e H_{2}$ molecule has a zero dipole moment although the Be–H bonds are polar.

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Q.

The shape of ${XeO}_{2} F_{2}$ molecule is:

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

$S i F_{4}$
$B F_{3}$
$P F_{3}$
$P F_{5}$

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Q. Which of the following statements is true regarding

N F_{3}

and

N H_{3}

?

The dipole moment of $N F_{3}$ is zero
The dipole moment of $N F_{3}$ is less than $N H_{3}$
The dipole moment of $N F_{3}$ is more than $N H_{3}$
The dipole moment of $N H_{3}$ is zero

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Q. Arrange the following compounds in order of increasing dipole moment. (I) Toluene (II) m - dichlorobenzene (III) o - dichlorobenzene (IV) p - dichlorobenzene

I < IV < II < III
IV < I < II < III
IV < I < III < II
IV < II < I < III

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Q. The correct order of increasing dipole moments is:

$H I < H B r < H C l < H F$
$H B r < H I < H C l < H F$
$H I < H B r < H F < H C l$
$H F < H C l < H B r < H I$

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Q.

Although both $C O_{2}$ and $H_{2} O$ are triatomic molecules, the shape of $H_{2} O$ molecule is bent while that of $C O_{2}$ is linear. Explain this on the basis of dipole moment.

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Q. Which of the following compounds possesses zero dipole moment?

$C_{6} H_{6} (b e n z e n e)$
$C C l_{4}$
All of these
$B F_{3}$

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Q. Which of the following has been arranged in the order of decreasing dipole moments?

$C H_{3} C l > C H_{3} F > C H_{3} B r > C H_{3} I$
$C H_{3} F > C H_{3} C l > C H_{3} I > C H_{3} B r$
$C H_{3} F > C H_{3} C l > C H_{3} B r > C H_{3} I$
$C H_{3} C l > C H_{3} B r > C H_{3} I > C H_{3} F$

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Q.

What is the shape of ${ClF}_{5}$ using VSEPR Theory?

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Q. In an alloy of copper, silver and gold, the copper atoms constitute the ccp lattice and silver atoms occupies half of the tetrahedral voids and gold is present at the octahedral voids of the unit cell.
What will be the formula of the compound if all the atoms from one of the faces of the cube are removed?

$C u_{8} A g_{4} A u_{3}$
$C u_{3} A g_{3} A u_{4}$
$C u_{8} A g_{3} A u_{3}$
$C u_{3} A g_{4} A u_{3}$

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Q.

Which of the following elements can be involved in $pπ - dπ$ bonding?

Nitrogen
Carbon
Boron
Phosphorus

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Q. In a solution of 7.8 g benzene (C, H) and 46.0gtolueneC. H CH) the mole fraction of benzene is:-62 (4)3

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Q. The

H - O H

bond angle in water is

105^{o}

. The

H - O H

bond distance being 0.94

\circ A

. The dipole moment for the molecule is 1.85 D. Calculate the charge on oxygen atom.
Given: cos

105^{o}

=

- 0.25

$1.617 \times 10^{- 10}$ esu
$1.617 \times 10^{- 10}$ C
$1.167 \times 10^{- 12}$ esu
$1.167 \times 10^{- 15}$ esu

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Q. A compound forms cubic close packed structure. What is the total number of voids in

1.2 m o l

of it?

$10.83 \times 10^{22}$
$21.68 \times 10^{23}$
$7.22 \times 10^{23}$
$15.22 \times 10^{23}$

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Q. The correct increasing order of dipole moments for the given molecules is:

(B F_{3}, N F_{3}

and

N H_{3})

$B F_{3} > N F_{3} > N H_{3}$
$N F_{2} > B F_{3} > N H_{3}$
$N H_{3} > N F_{3} > B F_{3}$
$N H_{3} > B F_{3} > N F_{3}$

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Q. If the observed dipole moment of

H C l

is

1.03 D

and the distance between the atoms is

1.27 \times 10^{- 8} cm

, what will be the percentage ionic character of

H C l

?

83%
25%
17%
90%

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Q. Which bond angle

(θ)

would result in the maximum dipole moment for the triatomic molecule

X Y_{2}

$θ$ = $90^{o}$
$θ$ = $120^{o}$
$θ$ = $150^{o}$
$θ$ = $180^{o}$

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