Worksheets9.5 Electrolysis
Total questions: 12
Worksheet time: 26mins
Name
Class
Date
1.
What happens at the positive electrode in a voltaic cell and in an electrolytic cell?
a)
A
b)
B
c)
C
d)
D
2.
What are produced at positive/negative electrodes during electrolysis of molten NaCI?
a)
A
b)
B
c)
C
d)
D
3.
What process occurs at cathode in voltaic cell and at anode in electrolytic cell?
a)
A
b)
B
c)
C
d)
D
4.
Which factors affect amount of metal formed during electrolysis?
a)
I and II
b)
I and III
c)
II and III
d)
I, II and III
5.
What occurs during electrolysis of a molten salt?
a)
Electricity is produced by a spontaneous redox reaction
b)
Electricity cause a non-spontaneous redox reaction to occur
c)
Electrons flow through the molten salt
d)
Electrons are removed from both ions of the molten salt
6.
Object is electroplated with copper using copper(II) sulfate. Which statement is correct?
a)
Positive electrode increases in mass
b)
Concentration of Cu2+ ions in solution decreases
c)
Reduction occurs at positive electrode
d)
Reaction at negative electrode is Cu2+ + 2e– → Cu
7.
Which are used for electroplating of a metal spoon with copper?
a)
I and II
b)
I and III
c)
II and III
d)
I, II and III
8.
What happens when molten NaCI is electrolysed in electrolytic cell?
a)
Chlorine is produced at positive electrode
b)
Sodium ions lose electrons at negative electrode
c)
Electrons flow through liquid from -ve electrode to +ve electrode
d)
Oxidation occurs at -ve electrode and reduction at +ve electrode
9.
Electrolysis of a molten salt containing Sn2+. Which change will double amount of tin produced?
a)
I
b)
II
c)
I and II
d)
I, II and III
10.
NaCl(aq) was electrolysed with platinum. State the major product at +ve electrode in each case?
a)
A
b)
B
c)
C
d)
D
11.
Two cells with same current and same length of time. Tin form is 0.01mol. Copper formed will be
a)
0.005 mol
b)
0.01 mol
c)
0.02 mol
d)
0.05 mol
12.
Which statement is correct on electrolysis of aqueous copper(II) sulfate using graphite electrodes?
a)
Colourless gas is produced at negative electrode
b)
Electrolyte does not change colour
c)
Negative electrode decreases in mass
d)
Colourless gas is produced at positive electrode
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