Chemistry: Matter and Change

Chapter 19: Redox Reactions

Chapter Test Practice

1
When is the oxidation number of oxygen not -2?
A)in water
B)in oxyacids
C)in peroxide
D)in sulfuric acid
2
Select the compound in which chlorine has the highest possible oxidation number.
A)HCl
B)HClO
C)HClO3
D)HClO4
3
The most electronegative atom in a compound has a charge that is __________.
A)positive
B)negative
C)neutral
D)zero
4
What is the oxidation number of magnesium after it is burned?

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A)0
B)1
C)2
D)3
5
What are the oxidation numbers of K and Cl after the reaction?

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A)K = -1, Cl = 1
B)K = 0, Cl = 0
C)K = 1, Cl = -1
D)K = -1, Cl = -1
6
Complete and balance the following redox equation. When properly balanced with whole—number coefficients, the coefficient of S is _________.

H2S + HNO3 → S + NO + H2O
A)1
B)2
C)3
D)4
7
Balance the following ionic equation. What is the coefficient of the reducing agent in this reaction?

Fe2+(aq) + MnO4-(aq) + H+(aq) → Fe3+(aq) + Mn2+(aq) + H2O(l)
A)5
B)1
C)8
D)4
8
What is the net change in oxidation number of iodine in the following ionic reaction?

2MnO4- + I- + H2O → 2MnO2 + IO3- + 2OH-
A)1
B)2
C)3
D)6
9
What is the oxidation number for each of these reactions before the reaction occurs?

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A)-1
B)0
C)1
D)2
10
Balance the following equation with the smallest whole—number coefficients. How many moles of zinc will react with 6 moles of cobalt(III) chloride?

Zn(s) + CoCl3(aq) → ZnCl2(aq) + Co(s)
A)2
B)3
C)6
D)9
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