Free Printable Oxidation Number

1.

What is the oxidation number of O in CO₂?

a)

+2

b)

-1

c)

+4

d)

-2

2.

What is the oxidation number of N in NO₂^1-?

a)

-3

b)

+4

c)

-2

d)

+3

3.

What is the oxidation of C in CH₄?

a)

-4

b)

-1

c)

+4

d)

+1

4.

What is oxidation number of Mn in MnO₂ ?

a)

0

b)

+2

c)

-2

d)

+4

5.

What is the oxidation number of S in SO₄^2-?

a)

-2

b)

+2

c)

+6

d)

-4

6.

What is oxidation number of Cr in
Cr₂O₇^2-?

a)

-2

b)

+2

c)

+6

d)

+12

7.

Oxidation number of O in the compound H₂O₂:

a)

0

b)

-1

c)

-2

d)

+2

8.

What is the oxidation state of H in H₂?

a)

+2

b)

+1

c)

0

d)

None of the above

9.

Give the oxidation number for the underlined atoms below.

a)

+4

b)

-4

c)

+2

d)

-2

10.

Give the oxidation number for the underlined atoms below.

a)

-2

b)

+2

c)

+1

d)

-1

11.

Determine the oxidation number of the red underlined element.

NaCl

a)

+1

b)

-1

c)

-2

d)

0

12.

Determine the oxidation number of the red underlined element.

NH₄⁺

a)

+3

b)

-1

c)

-3

d)

0

13.

Determine the oxidation number of the red underlined element.

AlPO₄

a)

+5

b)

-3

c)

-5

d)

-1

14.

Determine the oxidation number of the red underlined element.

HSO₄^-1

a)

+6

b)

-2

c)

+5

d)

-1

15.

oxidation number Cu²⁺ is ...

a)

-1

b)

0

c)

+1

d)

+2

16.

oxidation number Na+ is ...

a)

0

b)

+1

c)

+2

d)

+3

17.

oxidation number Mg is ...

a)

0

b)

+1

c)

+2

d)

+3

18.

What is the oxidation number of Fe in FeO?

a)

+1

b)

-1

c)

+2

d)

-2

19.

What is oxidation number of Cr in
Cr₂O₇^2-?

a)

-2

b)

+2

c)

+6

d)

+12

20.

What is the oxidation state of Cl in ClO^-?

a)

0

b)

+1

c)

-1

d)

+2

21.

What is the oxidation number of oxygen in H2O?

a)

1

b)

0

c)

-2

d)

3

22.

What is the oxidation number of hydrogen in HCl?

a)

0

b)

+2

c)

+1

d)

-1

23.

What is the oxidation number of chlorine in NaCl?

a)

-1

b)

-2

c)

+1

d)

0

24.

What is the oxidation number of carbon in CH4?

a)

0

b)

1

c)

2

d)

-4

25.

What is the oxidation number of nitrogen in NH3?

a)

-3

b)

+2

c)

0

d)

-1

26.

What is the oxidation number of sulfur in H2SO4?

a)

-4

b)

+2

c)

+8

d)

+6

27.

What is the oxidation number of potassium in K2SO4?

a)

0

b)

+2

c)

+1

d)

-1

28.

What is the oxidation number of magnesium in MgCl2?

a)

+1

b)

-2

c)

0

d)

+2

29.

What is the oxidation number of phosphorus in PCl3?

a)

-2

b)

+3

c)

+5

d)

0

30.

What is the oxidation number of iron in Fe2O3?

a)

+3

b)

+5

c)

+1

d)

-2

31.

What is oxidation number of H in H₂O?

a)

0

b)

-2

c)

-1

d)

+1

32.

What is oxidation number of Fe in FeO ?

a)

+2

b)

-2

c)

0

d)

+1

33.

What is oxidation number of Ca in CaCl₂ ?

a)

-1

b)

-2

c)

+1

d)

+2

34.

What is oxidation number of O in O₂ ?

a)

0

b)

-2

c)

+1

d)

+2

35.

What is oxidation number of Na⁺ ?

a)

0

b)

+1/2

c)

+1

d)

-1

36.

What is oxidation number of Mn in MnO₂ ?

a)

0

b)

+2

c)

-2

d)

+4

37.

The sum of all oxidation numbers in a neutral compound is ___.

a)

0

b)

1

c)

-1

d)

depends on the compound

38.

What elements always have oxidation numbers of zero?

a)

alkali metals

b)

noble gases

c)

halogens

d)

alkaline earth metals

39.

What is the oxidation number of magnesium (Mg)?

a)

+2

b)

-2

c)

12

d)

0

40.

What is the oxidation number for fluorine (F₂)?

a)

+1

b)

-1

c)

0

d)

9

41.

Ionic bonds form between metals and ____.

a)

metalloids

b)

metals

c)

nonmetals

42.

A anion will be a ____ ion.

a)

negative

b)

positive

43.

What is the correct formula for a compound formed from Na⁺and S ^-2

a)

Na₂S

b)

NaS₂

c)

Na₂S₂

d)

NaS

44.

What is the correct formula for a compound formed from the ions K ⁺ and N^-3

a)

KN

b)

KN₃

c)

K₃N₃

d)

K₃N

45.

What is the oxidation number of magnesium in magnesium chloride (MgCl₂)?

a)

+2

b)

-2

c)

12

d)

0

46.

Determine the oxidation number of the following element: Aluminum (Al)

(a)

47.

Determine the oxidation number of the following element: Krypton (Kr)

(a)

48.

Determine the oxidation number of the following element: Germanium (Ge)

(a)

49.

Determine the oxidation number of the following element: Lithium (Li)

(a)

50.

Determine the oxidation number of the following element: Strontium (Sr)

(a)

51.

Determine the oxidation number of the following element: Chlorine (Cl)

(a)

52.

Determine the oxidation number of the following element: Nitrogen (N)

(a)

53.

Determine the oxidation number of the following element: Magnesium (Mg)

(a)

54.

Determine the oxidation number of the following element: Sulfur (S)

(a)

55.

Determine the oxidation number of the following element: Hydrogen (H)

(a)

56.

Determine the oxidation number of the following element: Helium (He)

(a)

57.

Determine the oxidation number of the following element: Phosphorus (P)

(a)

58.

Sodium (Na) will more likely bond with:

a)

Bromine (Br)

b)

Sulfur (S)

59.

Calcium (Ca) will more likely bond with:

a)

Nitrogen (N)

b)

Oxygen (O)

60.

Aluminum (Al) will more likely bond with:

a)

Arsenic (As)

b)

Chlorine (Cl)

61.

Hydrogen (H) will more likely bond with:

a)

Sulfur (S)

b)

Fluorine (F)

62.

Beryllium (Be) will more likely bond with:

a)

Argon (Ar)

b)

Selenium (Se)

63.

Nitrogen (N) will more likely bond with:

a)

Potassium (K)

b)

Boron (B)

64.

Determine the oxidation number of the red underlined element.

NaCl

a)

+1

b)

-1

c)

-2

d)

0

65.

Determine the oxidation number of the red underlined element.

NaClO₄

a)

+7

b)

-1

c)

+6

d)

0

66.

Determine the oxidation number of the red underlined element.

NH₄⁺

a)

+3

b)

-1

c)

-3

d)

0

67.

Determine the oxidation number of the red underlined element.

NH₂^-1

a)

+3

b)

-1

c)

-3

d)

0

68.

Determine the oxidation number of the red underlined element.

CaCrO₄

a)

+6

b)

-2

c)

-6

d)

+8

69.

Determine the oxidation number of the red underlined element.

AlPO₄

a)

+5

b)

-3

c)

-5

d)

-1

70.

Determine the oxidation number of the red underlined element.

AsO₄^-3

a)

+5

b)

-3

c)

-5

d)

-1

71.

Determine the oxidation number of the red underlined element.

HSO₄^-1

a)

+6

b)

-2

c)

+5

d)

-1

72.

Determine the oxidation number of the red underlined element.

CaN₂

a)

+1

b)

-3

c)

-1

d)

0

73.

Determine the oxidation number of the red underlined element.

HNO₂

a)

+1

b)

-3

c)

-1

d)

+3

74.

Determine the oxidation number of the red underlined element.

NO₂^-1

a)

+1

b)

-3

c)

-1

d)

+3

75.

Determine the oxidation number of the red underlined element.

BrO₃^-1

a)

+1

b)

-5

c)

-1

d)

+5

76.

Determine the oxidation number of the red underlined element.

B₄O₇^2-

a)

+4

b)

-3

c)

-4

d)

+3

77.

What is the charge for an ion in group 1?

a)

+1

b)

-7

c)

-1

d)

+7

78.

What is the charge of an ion in group 2?

a)

+2

b)

-6

c)

-2

d)

+6

79.

What is the charge of an ion in group 13?

a)

+3

b)

-3

c)

-5

d)

+5

80.

What is the charge of the cobalt(IV) ion?

a)

+4

b)

-4

c)

+6

d)

+5

81.

What is the charge of the iron(III) ion?

a)

+3

b)

-3

c)

+2

d)

+1

82.

What element's don't have oxidation numbers?

a)

alkali metals

b)

noble gases

c)

halogens

d)

alkaline earth metals

83.

Why are ions formed?

a)

To make our lives difficult

b)

Because atoms want 8 valence electrons

c)

Because atoms have the same number of protons and electrons

d)

Because atoms gained neutrons

84.

Cations are

a)

positive

b)

negative

c)

on the right side of the periodi table.

d)

nonmetals

85.

Anions are _______ that form ____________ ions and __________ electrons.

a)

nonmetals, positive, lose

b)

nonmetals, negative, gain

c)

metals, positive, gain

d)

metals, positive, lose

86.

What is the charge of an ion in group 7?

a)

+7

b)

-7

c)

+1

d)

-1

87.

What is the charge of the mercury(II) ion?

a)

+11

b)

+2

c)

-2

d)

-11

88.

What is the charge of an ion in group 6?

a)

-6

b)

+6

c)

-2

d)

+2

89.

What are oxidation numbers?

a)

Number of electrons in the outer most energy level

b)

Number of protons

c)

Electrons gained or lost in chemical bonding

d)

Number of neutrons gained or lost

90.

What are valence electrons?

a)

Number of electrons in the outer most energy level

b)

Number of electrons gained or lost

c)

Number of electrons in the inner energy level

d)

Number of electrons

91.

Determine the oxidation numbers and Valence Electrons for Br.

a)

-1, 7

b)

+3, 2

c)

-1, 3

d)

+7, 3

92.

Determine the oxidation numbers and Valence Electrons for Ca

a)

+2, 4

b)

-3, 2

c)

+2, 2

d)

-2, 2

93.

Determine the oxidation numbers and Valence Electrons for S.

a)

-2, 6

b)

-6, 2

c)

-5, 1

d)

+2, 4

94.

What is the oxidation number of chlorine in KCl?

a)

+1

b)

-1

c)

+5

d)

+7

95.

What is the oxidation number of sulfur in $H_2SO_4$

a)

0

b)

-2

c)

+2

d)

+6

96.

Determine the oxidation number of the red underlined element.

NaCl

a)

+1

b)

-1

c)

-2

d)

0

97.

Determine the oxidation number of the red underlined element.

NaClO₄

a)

+7

b)

-1

c)

+6

d)

0

98.

Determine the oxidation number of the red underlined element.

NH₄⁺

a)

+3

b)

-1

c)

-3

d)

0

99.

Determine the oxidation number of the red underlined element.

NH₂^-1

a)

+3

b)

-1

c)

-3

d)

0

100.

Determine the oxidation number of the red underlined element.

CaCrO₄

a)

+6

b)

-2

c)

-6

d)

+8

101.

Determine the oxidation number of the red underlined element.

AlPO₄

a)

+5

b)

-3

c)

-5

d)

-1

102.

Determine the oxidation number of the red underlined element.

AsO₄^-3

a)

+5

b)

-3

c)

-5

d)

-1

103.

Determine the oxidation number of the red underlined element.

HSO₄^-1

a)

+6

b)

-2

c)

+5

d)

-1

104.

Determine the oxidation number of the red underlined element.

CaN₂

a)

+1

b)

-3

c)

-1

d)

0

105.

Determine the oxidation number of the red underlined element.

HNO₂

a)

+1

b)

-3

c)

-1

d)

+3

106.

Determine the oxidation number of the red underlined element.

NO₂^-1

a)

+1

b)

-3

c)

-1

d)

+3

107.

Determine the oxidation number of the red underlined element.

BrO₃^-1

a)

+1

b)

-5

c)

-1

d)

+5

108.

Determine the oxidation number of the red underlined element.

B₄O₇^2-

a)

+4

b)

-3

c)

-4

d)

+3

109.

What is the oxidation number of chlorine in HClO?

a)

0

b)

-1

c)

+1

d)

+5

110.

Oxidation is the _________ of electrons.

a)

loss

b)

gain

c)

sharing

d)

transfer

111.

Reduction is the ___________ of electrons.

a)

loss

b)

gain

c)

sharing

d)

transfer

112.

What is the oxidation number of nitrogen in N₂?

a)

-3

b)

0

c)

+4

d)

-1

113.

Given the following balanced chemical equation:

N₂ + 3 H₂ → 2 NH₃

What is the oxidation number of hydrogen in the product?

a)

+1

b)

-1

c)

0

d)

+2

114.

The sum of the oxidation numbers in SCN^- is equivalent to

a)

0

b)

-1

c)

+1

d)

+3

115.

Given the following balanced equation:

2 Al + 3 Cu²⁺ → 2 Al³⁺ + 3 Cu

The oxidation number of the copper reactant (left side) is

a)

0

b)

+2

c)

-1

d)

+1

116.

The sum of the oxidation numbers in Na₂CO₃ is equivalent to

a)

0

b)

-2

c)

+1

d)

-1

117.

What is the oxidation number of iodine in KIO₃?

a)

0

b)

-1

c)

+5

d)

+1

118.

Determine the oxidation number of chromate in CrO₄^2-.

a)

+6

b)

0

c)

+2

d)

+3

119.

Given the balanced equation:

Zn + CuSO₄ → ZnSO₄ + Cu

What is the oxidation number of sulfur in the substance on the left side of the equation?

a)

0

b)

-2

c)

+4

d)

+6

120.

The sum of the oxidation numbers in LiH is equal to

a)

0

b)

+1

c)

-1

d)

-3

121.

Given the following balanced chemical equation:

2 Li + Mg²⁺ → 2 Li⁺ + Mg

What is the oxidation number of the magnesium product (right side)?

a)

0

b)

+2

c)

-1

d)

+1

122.

Determine the oxidation number of phosphorous in PO₂^-.

a)

0

b)

-3

c)

+3

d)

+5

123.

What is the oxidation number of nickel in NiSO₃?

a)

+2

b)

+3

c)

0

d)

-1

124.

Assign the oxidation number of chlorine in HCl.

a)

-2

b)

+1

c)

0

d)

-1

125.

Determine the oxidation number of sulfur in H2SO4.

a)

+6

b)

-4

c)

0

d)

+2

Oxidation Number

Total questions: 125

Worksheet time: 3hrs 24mins

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