Higher Chemistry
Unit 3
Section 5 Redox Reactions
Multiple Choice Questions
This is designed to be used by teachers to help students develop
skills in answering multiple choice questions.
Douglas Racey, Waid Academy, Anstruther, Fife, Scotland
Higher Chemistry Unit 3 - Section 5
1.
Redox Reactions
Multiple Choice Questions
If 96,500C of electricity are passed through separate
solutions of copper(II)chloride and nickel(II) chloride,
then
A.
B.
C.
D.
equal masses of copper and nickel will be
deposited
the same number of atoms of each metal will be
deposited
the metals will be plated on the positive
electrode
different numbers of moles of each metal will
be deposited
Answer
B.
Higher Chemistry Unit 3 - Section 5
2.
Redox Reactions
Multiple Choice Questions
The ion-electron equations for a redox reaction are
2I-(aq)

I2(aq) +
2eMnO4-(aq) + 8H+(aq) + 5e- 
Mn2+(aq) + 4H2O(l)
How many moles of iodide ions are oxidised by one mole of
permanganate ions?
A.
B.
C.
D.
0.2
0.4
2
5
Answer
D.
Higher Chemistry Unit 3 - Section 5
3.
Redox Reactions
Multiple Choice Questions
In which of the following reactions is
hydrogen gas acting as an oxidising
agent?
A.
B.
C.
D.
H 2 + C 2H 4
H2 + Cl2
H2 + 2Na
H2 + CuO
Answer




C 2H 6
2HCl
2NaH
H2O + Cu
D.
Higher Chemistry Unit 3 - Section 5
4.
Redox Reactions
Multiple Choice Questions
Which of the following is a redox reaction?
A.
B.
C.
D.
NaOH + HCl

NaCl + H2O
Zn + 2HCl

ZnCl2 + H2
NiO + 2HCl

NiCl2 + H2O
CuCO3 + 2HCl  CuCl2 + H2O + CO2
Answer
B.
Higher Chemistry Unit 3 - Section 5
5.
Redox Reactions
Multiple Choice Questions
The reduction of copper ions during electroplating can be
represented as:
Cu2+(aq) + 2e
Cu(s)
What is the quantity of electricity needed to produce 0.25
moles of copper?
A.
B.
C.
D.
24 125 C
48 250 C
96 500 C
193 000 C
Answer
B.
Higher Chemistry Unit 3 - Section 5
6.
Redox Reactions
Multiple Choice Questions
Which of the following is a redox reaction?
A.
B.
C.
D.
Mg + 2HCl

MgCl2 + H2
MgCO3 + 2HCl 
MgCl2 + H2O + CO2
MgO + 2HCl
MgCl2 + H2O

Mg(OH) 2+ 2HCl  MgCl2 + H2O
Answer
A.
Higher Chemistry Unit 3 - Section 5
7.
Redox Reactions
Multiple Choice Questions
The iodate ion, IO3-, can be converted to iodine.
Which is the correct ion-electron equation for the
reaction?
A.
B.
C.
D.
2IO3- + 12H+ +12e-  2I- + 6H2O
IO3- + 6H+ +7e-  I- + 3H2O
2IO3- + 12H+ +11e-  I2 + 6H2O
2IO3- + 12H+ +10e-  I2 + 6H2O
Answer
D.
Higher Chemistry Unit 3 - Section 5
Redox Reactions
Multiple Choice Questions
8. HgCl2(aq) + SnCl2 (aq)  Hg(l) + SnCl4(aq)
What ion is oxidised in the above redox
reaction?
A.
B.
C.
D.
Sn2+(aq)
Sn4+(aq)
Hg2+(aq)
Cl-(aq)
Answer
A.
Higher Chemistry Unit 3 - Section 5
Redox Reactions
Multiple Choice Questions
9. HgCl2(aq) + SnCl2 (aq)  Hg(l) + SnCl4(aq)
What ion is the oxidising agent in the above
redox reaction?
A.
B.
C.
D.
Sn2+(aq)
Sn4+(aq)
Hg2+(aq)
Cl-(aq)
Answer
C.
Higher Chemistry Unit 3 - Section 5
Redox Reactions
Multiple Choice Questions
10. The ion-electron equations for a redox reaction are
2I-(aq)  I2(aq) + 2eMnO4-(aq) + 8H+(aq) + 5e-  Mn2+(aq) + 4H2O(l)
How many moles of iodide ions are oxidised by one mole of
permanganate ions?
A.
B.
C.
D.
0.2
0.4
2
5
Answer
D.