Shapes of Molecules and Intermolecular Forces Exam-style MCQs | A-Level Chemistry CIE

Question 1

Which statement is correct about electronegativity?

A

it increases from left to right across a period

B

it increases down a group

C

it measures the negative charge on an atom

D

the smaller the electronegativity difference between two elements, the more likely the bond between them is ionic

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Question 2

The hydride with the highest boiling temperature is

A

CH₄

B

NH₃

C

H₂O

D

HF

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Question 3

Which of these molecules is polar?

A

OF₂

B

BF₃

C

CF₄

D

PF₅

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Question 4

In which pair do the molecules have the same shape as each other?

A

H₂O and CO₂

B

H₂O and SCl₂

C

NH₃ and BH₃

D

SCl₂ and BeCl₂

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Question 5

Tetrachloromethane, CCl₄, is a

A

polar molecule with polar bonds

B

polar molecule with non-polar bonds

C

non-polar molecule with polar bonds

D

non-polar molecule with non-polar bonds

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Question 6

Which statement about electronegativity is correct?

A

electronegativity is the charge on an element’s ion

B

if a bond is polar, the two atoms have different electronegativities

C

if a molecule has no dipole, all its atoms have the same electronegativity

D

electronegativity increases down a group of the periodic table

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Question 7

What is the bond angle in the NH₂^- ion?

A

104.5°

B

107°

C

120°

D

180°

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Question 8

Which molecule has the smallest bond angle?

A

BCl₃

B

BeCl₂

C

NCl₃

D

SiCl₄

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Question 9

Which statement about induced dipole-dipole forces is correct?

A

they become weaker with increasing chain length of an organic compound

B

they become stronger with increased branching in organic compounds

C

they occur between molecules rather than atoms in molecules

D

in any molecule they are always the weakest intermolecular bond

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Question 10

Which molecule forms permanent dipole-dipole forces as its strongest intermolecular force?

A

CH₃CHO

B

CH₃COOH

C

CCl₄

D

CO₂

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Question 11

The boiling point of hydrogen bromide is -67 ºC.

The boiling point of hydrogen iodide is -34 ºC.

The different boiling points can be explained in terms of the strength of bonds or interactions.

Which bonds or interactions are responsible for the higher boiling point of hydrogen iodide?

A

covalent bonds

B

hydrogen bonds

C

permanent dipole-dipole interactions

D

induced dipole-dipole interactions

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Question 12

Which statement explains why ice is less dense than water?

A

hydrogen bonds are stronger in ice than in water

B

hydrogen bonds hold H₂O molecules apart in ice

C

ice is a solid but water is a liquid

D

ice contains hydrogen bonds, but water does not contain hydrogen bonds

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Question 13

Which molecule has the largest dipole?

A

ClF₃

B

BF₃

C

SF₆

D

CF₄

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Question 14

Which species has one or more bond angle(s) of 90°?

A

CH₄

B

NH₄⁺

C

ClF₄^-

D

AlCl₄^-

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Question 15

Which compound has hydrogen bonding?

A

NaH

B

NH₃

C

HI

D

SiH₄

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Question 16

Which species is not pyramidal in shape?

A

PF₃

B

H₃O⁺

C

CH₃^-

D

BF₃

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