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Unit 2 AP Chemistry (Set I)

Total questions: 40

Worksheet time: 30mins

Name
Class
Date
1.

Which of the following compounds is covalent?

a)

Na2O

b)

SO2

c)

CaCl2

d)

MgBr2

2.

Which of the following molecules has a central atom with a formal charge of zero?

a)

NH3

b)

CO2

c)


SO4−2SO_4^{-2}

d)

BF3

3.

What is the molecular geometry of BeCl2 based on the VSEPR theory?

a)

Linear

b)

Bent

c)

Tetrahedral

d)

Trigonal Planar

4.

Which molecule primarily exhibits hydrogen bonding?

a)

CH4

b)

HF

c)

Ne

d)

I2

5.

Which of the following elements is the least electronegative?

a)

Fluorine

b)

Oxygen

c)

Nitrogen

d)

Cesium

6.

How many resonance structures can be drawn for the nitrate ion NO3−NO_3^-

a)

1

b)

2

c)

3

d)

4

7.

Which compound is expected to have the highest lattice energy?

a)

NaF

b)

MgO

c)

KI

d)

CaS

8.

Which of the following molecules is non-polar?

a)

H2O

b)

NH3

c)

CO2

d)

OF2

9.

The sea of electrons in metallic bonding is responsible for which property of metals?

a)

Insolubility in water

b)

High malleability and ductility

c)

Ability to form complex ions

d)

Tendency to form covalent bonds

10.

Which of the following pairs of elements is least likely to form an ionic bond?

a)

Ca and O

b)

Na and Br

c)

C and H

d)

Mg and Cl

11.

Which of the following ions has a noble gas electron configuration?

a)

O2-

b)

Al3+

c)

S2-

d)

Mg2+

12.

In the Lewis structure of CO3−2CO_3^{-2} ​, what is the formal charge on the central carbon atom?

a)

+1

b)

0

c)

-1

d)

+2

13.

As you move down a group in the periodic table, how does the size of cations change?

a)

They get larger

b)

They get smaller

c)

They remain roughly the same size

d)

The trend is unpredictable

14.

Which of the following molecules is polar?

a)

BCl3

b)

CCl4

c)

SO3

d)

SO2

15.

What is the hybridization of the central atom in PCl5

a)

sp

b)

sp2

c)

sp3

d)

sp3d

16.

Which molecule obeys the octet rule for all of its atoms?

a)

SF4

b)

PCl3

c)

BF3

d)

NO

17.

Which of the following compounds primarily exhibits dipole-dipole interactions?

a)

Br2

b)

CH3CH2OH

c)

CH3OCH3

d)

N2

18.

Which bond is expected to be shortest in length?

a)

C-C

b)

C=N

c)

C≡N

d)

C-O

19.

What is the bond order of the diatomic nitrogen (N2​) molecule?

a)

1

b)

1.5

c)

2

d)

3

20.

Which bond is expected to have the highest bond energy?

a)

H-H

b)

O=O

c)

O-O

d)

H-F

21.

Which atom in the second period of the periodic table has the greatest effective nuclear charge?

a)

Li

b)

C

c)

Ne

d)

O

22.

Which molecule/ion does NOT exhibit resonance?

a)

O3

b)

CO2

c)

SO4−2SO_4^{-2}

d)

NO3−NO_3^-

23.

Which of the following ionic compounds has the least lattice energy?

a)

LiF

b)

NaF

c)

LiCl

d)

NaCl

24.

In XeF4​, the central xenon atom exhibits what type of hybridization?

a)

sp

b)

sp2

c)

sp3d2

d)

sp3d

25.

What is the electron-pair geometry around the central atom in IF5?

a)

Trigonal bipyramidal

b)

Octahedral

c)

Square pyramidal

d)

Tetrahedral

26.

In the molecule ethene (C2H4​), how many sigma (σ) and pi (π) bonds are there, respectively?

a)

5 σ, 1 π

b)

4 σ, 2 π

c)

6 σ, 0 π

d)

3 σ, 3 π

27.

Given the electronegativity values: H = 2.1, C = 2.5, and O = 3.5, which bond is the most polar?

a)

C-H

b)

C-C

c)

O-H

d)

O-C

28.

Which substance has the highest boiling point based on its intermolecular forces?

a)

Ar

b)

H2

c)

H2O

d)

CH4

29.

In the ​SF4 molecule, which statement is true about its bond angles?

a)

All bond angles are 109.5°.

b)

The equatorial bond angles are larger than the axial angles.

c)

The axial bond angles are 90° to the equatorial plane.

d)

The equatorial bond angles are 180° to each other.

30.

Which molecule/ion has a tetrahedral electronic geometry but a bent molecular geometry?

a)

H2O

b)

CH4

c)

BF3

d)

CO2

31.

Which of the following compounds is likely to have the highest melting point due to strong ionic bonds?

a)

I2

b)

CO2

c)

CH4

d)

NaCl

32.

Which of these compounds is most soluble in water due to its ability to form hydrogen bonds with water molecules?

a)

CH4

b)

O2

c)

C6H6

d)

CH3OH

33.

Which substance will NOT conduct electricity when dissolved in water?

a)

NaBr

b)

CuSO4

c)

C6H12O6

d)

Ca(NO3)2

34.

Which of the following compounds has the highest boiling point due to strong hydrogen bonding?

a)

HF

b)

HCl

c)

HBr

d)

HI

35.

Which compound is most likely to be volatile (easily vaporized)?

a)

SiO2

b)

Na2O

c)

CH3CH2OH

d)

Ne

36.

Which substance is expected to have the highest viscosity due to its ability to form multiple hydrogen bonds?

a)

CH4

b)

CH3OH

c)

CH2(OH)2

d)

C2H6

37.

Which compound is expected to have the lowest lattice energy due to its larger ion sizes and lower charges?

a)

LiF

b)

KBr

c)

MgO

d)

Al2O3

38.

Which type of solid is most likely to exhibit elastic properties when deformed?

a)

Metallic solid

b)

Network covalent solid

c)

Molecular solid

d)

Ionic solid

39.

Which type of crystalline solid is typically the hardest due to strong directional covalent bonds throughout the crystal?

a)

Metallic solid

b)

Network covalent solid

c)

Molecular solid

d)

Ionic solid

40.

Which substance would be least soluble in nonpolar solvents?

a)

I2

b)

NaI

c)

CCl4

d)

H2O

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