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Bonding

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1

What is the formula for the compound formed by calcium and nitrogen?
A. CaN
B. Ca2N
C. Ca2N3
D. Ca3N2

D

2

What is the best description of the carbon-oxygen bond lengths in CO32–?
A. One short and two long bonds
B. One long and two short bonds
C. Three bonds of the same length
D. Three bonds of different lengths

C

3
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What is the number of sigma () and pi () bonds and the hybridization of the carbon atom in:

A

4

Element X is in group 2, and element Y in group 7, of the periodic table. Which ions will be present in the compound formed when X and Y react together?
A. X+ andY– B. X2+ andY– C. X+ andY2– D. X2– andY+

B

5

Which of the following increase(s) for the bonding between carbon atoms in the sequence of
molecules C2H6, C2H4 and C2H2?
I. Number of bonds II. Length of bonds III. Strength of bonding
A. I only
B. I and III only
C. III only
D. I, II and III

B

6

Which of the following contain a bond angle of 90°?
I. PC14+ II. PCl5 III. PCl6–
A. I and II only
B. I and III only
C. II and III only
D. I, II, and III

C

7

Which allotropes contain carbon atoms with sp2 hybridization?
I. Diamond II. Graphite III. C60 fullerene
A. I and II only
B. I and III only
C. II and III only
D. I, II, and III

C

8

Based on electronegativity values, which bond is the most polar?
A.B―C
B.C―O
C.N―O
D.O―F

B

9
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What is the Lewis (electron dot) structure for sulfur dioxide?

D

10

Which substance is most soluble in water (in mol dm–3) at 298 K?
A. CH3CH3
B. CH3OCH3
C. CH3CH2OH
D. CH3CH2CH2CH2OH

C

11
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What is the molecular shape and the hybridization of the nitrogen atom in NH3?

D

12

Which statement about sigma and pi bonds is correct?
A. Sigma bonds are formed only by s orbitals and pi bonds are formed only by p orbitals.
B. Sigma bonds are formed only by p orbitals and pi bonds are formed only by s orbitals.
C. Sigma bonds are formed by either s or p orbitals, pi bonds are formed only by p orbitals.
D. Sigma and pi bonds are formed by either s or p orbitals.

C

13

According to VSEPR theory, repulsion between electron pairs in a valence shell decreases in the order
A. lone pair-lone pair > lone pair-bond pair > bond pair-bond pair.
B. bond pair-bond pair > lone pair-bond pair > lone pair-lone pair.
C. lone pair-lone pair > bond pair-bond pair > bond pair-lone pair.
D. bond pair-bond pair > lone pair-lone pair > lone pair-bond pair.

A

14

Which molecule is linear?
A.SO2
B.CO2
C.H2S
D.Cl2O

B

15

Why is the boiling point of PH3 lower than that of NH3?
A. PH3 is non-polar whereas NH3 is polar.
B. PH3 is not hydrogen bonded whereas NH3 is hydrogen bonded.
C. Van der Waals’ forces are weaker in PH3 than in NH3.
D. The molar mass of PH3 is greater than that of NH3.

B

16

Which molecule is non-polar?
A. H2CO
B. SO3
C. NF3
D. CHCl3

B

17

Consider the following statements.
I. All carbon-oxygen bond lengths are equal in CO32–.
II. All carbon-oxygen bond lengths are equal in CH3COOH.
III. All carbon-oxygen bond lengths are equal in CH3COO–.
Which statements are correct?
A. I and II only
B. I and III only
C. II and III only
D. I, II and III

B

18

What happens when sodium and oxygen combine together?
A. Each sodium atom gains one electron.
B. Each sodium atom loses one electron.
C. Each oxygen atom gains one electron.
D. Each oxygen atom loses one electron.

B

19

Which statement is correct about two elements whose atoms form a covalent bond with each other?
A. The elements are metals.
B. The elements are non-metals.
C. The elements have very low electronegativity values.
D. The elements have very different electronegativity values.

B

20

In ethanol, C2H5OH (l), there are covalent bonds, hydrogen bonds and van der Waals’ forces. Which bonds or forces are broken when ethanol is vaporized?
A. only hydrogen bonds
B. covalent bonds and hydrogen bonds
C. covalent bonds and van der Waals’ forces
D. hydrogen bonds and van der Waals’ forces

D

21

Which substance has the lowest electrical conductivity?
A. Cu(s)
B. Hg(l)
C. H2(g)
D. LiOH(aq)

C

22

Which statement best describes the attraction present in metallic bonding?
A. the attraction between nuclei and electrons
B. the attraction between positive ions and electrons
C. the attraction between positive ions and negative ions
D. the attraction between protons and electrons

B

23

Which statement is correct about multiple bonding between carbon atoms?
A. Double bonds are formed by two π bonds.
B. Double bonds are weaker than single bonds.
C. π bonds are formed by overlap between s orbitals.
D. π bonds are weaker than sigma bonds.

D

24

When the following bond types are listed in decreasing order of strength (strongest first), what is the correct order?
A. covalent > hydrogen > van der Waals’
B. covalent > van der Waals’ > hydrogen
C. hydrogen > covalent > van der Waals’
D. van der Waals’ > hydrogen > covalent

A

25

Which statement is true for most ionic compounds?
A. They contain elements of similar electronegativity.
B. They conduct electricity in the solid state.
C. They are coloured.
D. They have high melting and boiling points.

D

26

What is the valence shell electron pair repulsion (VSEPR) theory used to predict?
A. The energy levels in an atom
B.The shapes of molecules and ions
C. The electronegativities of elements
D. The type of bonding in compounds

B

27

Which fluoride is the most ionic?
A.NaF
B.CsF
C.MgF2
D. BaF2

B

28

Which particles can act as ligands in complex ion formation?
I. C1– II. NH3 III. H2O
A. I and II only
B. I and III only
C. II and III only
D. I, II and III

D

29

Which statements correctly describe the NO2– ion?
I. It can be represented by resonance structures.
II. It has two lone pairs of electrons on the N atom.
III. The N atom is sp2 hybridized.
A. I and II only
B. I and III only
C. II and III only
D. I, II and III

B

30

30. Which substance is most similar in shape to NH3?
A. GaI3
B. BF3
C. FeCl3
D. PBr3

D

31

31. Which statement is a correct description of electron loss in this reaction? 2Al + 3S -> Al2S3
A. Each aluminium atom loses two electrons.
B. Each aluminium atom loses three electrons.
C. Each sulfur atom loses two electrons.
D. Each sulfur atom loses three electrons.

B

32

Which molecule has the smallest bond angle?
A.CO2
B.NH3
C.CH4
D.C2H4

B

33

In which substance is hydrogen bonding present?
A. CH4
B. CH2F2
C. CH3CHO
D. CH3OH

D

34

Which is a correct description of metallic bonding?
A. Positively charged metal ions are attracted to negatively charged ions.
B. Negatively charged metal ions are attracted to positively charged metal ions.
C. Positively charged metal ions are attracted to delocalized electrons.
D. Negatively charged metal ions are attracted to delocalized electrons.

C

35

Which is the smallest bond angle in the PF5 molecule?
A. 90
B. 109.5
C. 120
D. 180

A

36

Which types of hybridization are shown by the carbon atoms in the compound CH2 = CH-CH3?
I. sp II. sp2 III. sp3
A. I and II only
B. I and III only
C. II and III only
D. I, II and III

C

37

What intermolecular forces are present in gaseous hydrogen?
A. Hydrogen bonds
B. Covalent bonds
C. Dipole-dipole attractions
D.Van der Waals’ forces

D

38

Which molecule is polar?
A. CO2
B. PF3
C. CH4
D. BF3

B

39

What are responsible for the high electrical conductivity of metals?
A. Delocalized positive ions
B. Delocalized valence electrons
C. Delocalized atoms
D. Delocalized negative ions

B

40

Which compound has the least covalent character?
A. SiO2
B. Na2O
C. MgCl2
D. CsF

D

41

Identify the types of hybridization shown by the carbon atoms in the molecule CH3CH2CH2COOH:
I. sp II. sp2 III. sp3
A. I and II only
B. I and III only
C. II and III only
D. I, II and III

C

42

When C2H4, C2H2 and C2H6 are arranged in order of increasing C–C bond length, what is the correct order?
A. C2H6, C2H2, C2H4
B. C2H4, C2H2, C2H6
C. C2H2, C2H4, C2H6
D. C2H4, C2H6, C2H2

C

43

Which compound contains both ionic and covalent bonds?
A. MgCl2
B. HCl
C. H2CO
D. NH4Cl

D

44
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B

45

Which species has a trigonal planar shape?
A. CO3 2–
B. SO3 2–
C. NF3
D. PCl3

A

46

When C2H4, C2H2 and C2H6 are arranged in order of increasing C–C bond length, what is the correct order?
A. C2H6, C2H2, C2H4
B. C2H4, C2H2, C2H6
C. C2H2, C2H4, C2H6
D. C2H4, C2H6, C2H2

C

47

Which molecule is square planar in shape?
A. XeO4
B. XeF4
C. SF4
D. SiF4

B

48
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B

49

What is the formula for an ionic compound formed between an element, X, from group 2 and an element, Y, from group 6?
A.XY
B.X2Y
C.XY2
D.X2Y6

A

50

In the molecules N2H4, N2H2, and N2, the nitrogen atoms are linked by single, double and triple bonds, respectively. When these molecules are arranged in increasing order of the lengths of their nitrogen to nitrogen bonds (shortest bond first) which order is correct?
A. N2H4, N2, N2H2
B. N2H4, N2H2, N2
C. N2H2, N2, N2H4
D. N2, N2H2, N2H4

D

51

The compounds listed have very similar molar masses. Which has the strongest intermolecular forces?
A. CH3CHO
B. CH3CH2OH
C. CH3CH2F
D. CH3CH2CH3

B

52

52. What is the shape of the CO32– ion and the approximate O–C–O bond angle?
A. Linear, 180
B. Trigonal planar, 90
C. Trigonal planar, 120
D. Pyramidal, 109

C

53

What is the molecular geometry and the Cl–I–Cl bond angle in the ICl4– ion? A. Square planar, 90
B. Square pyramidal, 90
C. Tetrahedral 109
D. Trigonal pyramidal 107

A

54

What is the geometry of the bonds around an atom with sp2 hybridization? A. 2 bonds at 180
B. 3 bonds at 120
C. 2 bonds at 90, 1 bond at 180
D. 4 bonds at 109

B

55
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A

56

What is the formula of the compound formed when aluminium reacts with oxygen?
A. Al3O2
B. Al2O3
C. AlO2
D. AlO3

B

57

Which statement is true for compounds containing only covalent bonds?
A. They are held together by electrostatic forces of attraction between oppositely charged
ions.
B. They are made up of metal elements only.
C. They are made up of a metal from the far left of the periodic table and a non-metal from the far right of the periodic table.
D. They are made up of non-metal elements only.

D

58

How many electrons are used in the carbon-carbon bond in C2H2?
A. 4
B. 6
C. 10
D. 12

A

59

Which compound has the highest boiling point?
A. CH3CH2CH3
B. CH3CH2OH
C. CH3OCH3
D. CH3CHO

B

60

60. What type of solid materials are typically hard, have high melting points and poor electrical conductivities?
I. Ionic II. Metallic III. Covalent-network
A. I and II only
B. I and III only
C. II and III only
D. I, II and III

B

61
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C

62
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D


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