
IGCSE Electrochemistry MCQ
Authored by Julia K
Science
11th Grade
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9 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When substance X is electrolysed, the amount of gases P and Q formed is shown. What is substance X?
concentrated aqueous sodium chloride
concentrated hydrochloric acid
dilute sulfuric acid
molten lead(II) bromide
Answer explanation
P is hydrogen and Q is oxygen.
This is because P is double the amount of Q.
(hydrogen and oxygen are produced in the ratio 2:1(H2O))
From the answers, the only electrolyte that can produce hydrogen and oxygen through electrolysis is dilute sulfuric acid.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What are the products at the electrodes when dilute sulfuric acid is electrolysed using inert electrodes?
anode: hydrogen, cathode: oxygen
anode: oxygen, cathode: hydrogen
anode: sulfur, cathode: oxygen
anode: sulfur dioxide, cathode: hydrogen
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Electricity is passed separately through concentrated hydrochloric acid, concentrated aqueous sodium chloride and dilute sulfuric acid.
In which rows are the electrolysis products correctly named?
1, 2, and 3
1 and 2 only
1 and 3 only
2 and 3 only
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What describes the electrolysis of molten potassium bromide?
anode: bromine, cathode: hydrogen
anode: bromine, cathode: potassium
anode: hydrogen, cathode: bromine
anode: potassium, cathode: bromine
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The diagram shows a failed attempt to copper-plate a pan.
Which action will plate the pan with copper?
Cooling the copper sulfate solution in an ice bath
Heating the copper sulfate solution to boiling point
Increasing the voltage from 3V to 6V
Making the pan the cathode and copper the anode
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The diagram shows the electroplating of a steel object.
A student made the following statements.
Which statements are correct?
1,2, and 3
1 and 2 only
1 and 3 only
2 and 3 only
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The diagram shows the electroplating of a steel object.
A student made the following statements.
Which statements are correct?
1,2, and 3
1 and 2 only
1 and 3 only
2 and 3 only
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