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Section 1: Oxidation and Reduction

Oxidation and Reduction

1.

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What is the oxidation number of Group 17 nonmetals?
A)-1
B)0
C)1
D)3
2.
Which of the following describes oxidation?
A)gain of electrons
B)gain of positive charge
C)loss of electrons
D)loss of positive charge
3.
When is the oxidation number of oxygen not -2?
A)in water
B)in oxyacids
C)in peroxide
D)in sulfuric acid
4.
When an atom undergoes oxidation, the ___________ changes.
A)mass
B)identity
C)isotope
D)charge
5.
Oxidation is __________.
A)the loss of electrons and an increase in charge
B)the loss of electrons and a decrease in charge
C)the gain of electrons and an increase in charge
D)the gain of electrons and a decrease in charge
6.
What is the oxidation number of N in KNO3?
A)6
B)5
C)3
D)-3
7.
What is the oxidation number of O in Na2SO4?
A)6
B)1
C)+2
D)-2
8.
The highest possible oxidation number for carbon is ________.
A)+8
B)6
C)4
D)2
9.
Select the compound in which chlorine has the highest possible oxidation number.
A)HCl
B)HClO
C)HClO3
D)HClO4
10.
Which of the following reactions is a redox reaction?
A)H+(aq) + OH-(aq) → H2O(l)
B)2KBr(aq) + Pb(NO3)2(aq) → 2KNO3(aq) + PbBr2(s)
C)CaBr2(aq) + H2SO4(aq) → CaSO4(s) + 2HBr(aq)
D)2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g)
11.
In the following reaction, which chemical species is the oxidizing agent?
5H2O2 + 2MnO4- + 6H+ → 2Mn2+ + 8H2O + 5O2
A)H2O2
B)MnO4-
C)H+
D)Mn2+
12.
In a redox reaction, the number of electrons lost by the reducing agent ____________.
A)equals the number of protons in the reducing agent
B)equals the number of protons in the oxidizing agent
C)equals the number of electrons lost by the oxidizing agent
D)equals the number of electrons gained by the oxidizing agent
13.
The most electronegative atom in a compound has a charge that is __________.
A)positive
B)negative
C)neutral
D)zero
14.
Which of the following types of reactions do not usually involve redox?
A)synthesis
B)decomposition
C)single-replacement
D)double-replacement
15.
What element is oxidized in the following reaction?
3Cu + 8HNO3 → Cu(NO3)2 + 2NO + 4H2O
A)Cu
B)H
C)N
D)O
16.
Predict the products of the following single—replacement reaction.
Fe(s) + CuSO4(aq) → ?
A)CuS(s) + Fe2SO4(aq)
B)Fe(s) + Cu(s) + SO4(aq)
C)Cu(s) + FeSO4(aq)
D)FeCuSO4
17.
Group 1A metal ions have an oxidation number of _______.
A)1
B)2
C)3
D)-1
18.
What is the oxidizing agent in the following reaction?
6KOH(aq) + 3Cl2(g) → KClO3(aq) + 5KCl(aq) + 3H2O(l)
A)KOH
B)Cl2
C)KClO3
D)KCl
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