
Electrolysis MC diagnostic 1
Authored by Nicola Teh
Chemistry
9th - 11th Grade
Used 12+ times

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10 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
Why does a compound have to be in a liquid or aqueous state to be electrolysed?
So the ions are free to move
So the electrons are free to move
So the atoms are free to move
So the electrons and ions are free to move
2.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
When molten aluminium oxide is electrolysed, what is the half equation at the positive electrode?
Al3+ + 3e- --> Al
4OH- --> O2 + 2H2O + 4e-
O2- --> O2 + 2e-
2O2- --> O2 + 4e-
3.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
Copper (II) ions are represented as Cu2+. What does this mean?
Each copper atom has gained 2 electrons
Each copper atom has gained 2 protons
Each copper atom has lost 2 electrons
Copper molecules have lost 2 electrons
4.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
Copper (II) ions reduce to copper during the electrolysis of CuCl2(l). What is the half equation?
Cu2+ + 2e --> Cu
Cu2+ - 2e --> Cu
Cu2+ --> Cu + 2e-
Cu2+ + 2e- --> Cu
5.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
What is the half equation for oxidation of oxide ions?
O- + e- --> O2
2O2- --> O2 + e-
2O2- --> O2 + 2e-
2O2- --> O2 + 4e-
6.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
How are chloride ions represented?
Cl
Cl-
Cl2
Cl+
7.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
Chloride ions oxidise to chlorine during the electrolysis of molten CuCl2. What is the half equation?
Cl- + e --> Cl
Cl- --> Cl2 + e-
2Cl- --> Cl2 + 2e-
2Cl- + 2e- --> Cl2
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