Worksheetsredox reaction and electrolysis
Total questions: 10
Worksheet time: 9mins
What kind of substances can form electrolytes?
Ionic
covalent
metallic
Aluminium reacts with iron(III) oxide as shown.
iron(III) oxide + aluminium → iron + aluminium oxide
Which statement about this reaction is correct?
Aluminium is oxidised
iron is oxidised
iron(III) oxide is oxidised
Alumininum oxide is reduced
Which of the following is a true statement about the electrolysis of sodium chloride solution?
Hydrogen forms at the positive electrode
Sodium forms at the negative electrode
Chlorine forms at the positive electrode
What is formed at each electrode during the electrolysis of dilute sulfuric acid?
Hydrogen at the positive electrode and oxygen at the negative electrode
Hydrogen at the negative electrode and oxygen at the positive electrode
Hydrogen at the negative electrode and sulfur dioxide at the positive electrode
Which of these changes occurs during electrolysis?
Negative ions lose electrons at the negative electrode and are oxidised
Negative ions lose electrons at the positive electrode and are oxidised
Negative ions gain electrons at the negative electrode and are oxidised
Which of these is a description of oxidation?
The gain of oxygen
The loss of oxygen
The gain of hydrogen
Which substance is the reducing agent in this reaction?
Fe2O3 + 3CO → 2Fe + 3CO2
Fe2O3 (Iron(III) oxide)
CO (Carbon monoxide)
CO2 (Carbon dioxide)
Which of these equations shows reduction taking place?
Mg → Mg2+ + 2e
Cu - 2e → Cu2+
Cu2+ + 2e → Cu
Which element removes oxygen from iron(III) oxide in the industrial extraction of iron?
Copper
Calcium
Carbon
A
B
C
D
