Electrolysis and extraction of aluminium test questions - WJEC - GCSE Chemistry (Single Science) Revision

1

In electrolysis, what is the name of the negative electrode?

Electrolyte

Cathode

Anode

2

What happens at the anode during electrolysis?

Negative ions gain electrons

Positive ions gain electrons

Negative ions lose electrons

3

In the electrolysis of molten lead(II) bromide, what is the product at the anode?

Lead

Bromine

Oxygen

4

Which is the correct equation for the formation of chlorine gas at the anode during the electrolysis of concentrated sodium chloride solution? [Higher tier only]

2Cl^- + 2e^- → Cl₂

Cl^- → Cl + e^-

2Cl^- → Cl₂ + 2e^-

5

Where does oxidation take place during electrolysis? - [Higher tier only]

At the anode

At the cathode

In the electrolyte

6

What gas forms at the positive electrode during the extraction of aluminium by electrolysis?

Oxygen

Hydrogen

Aluminium

7

What are the electrodes made from in the extraction of aluminium?

Aluminium

Graphite

Steel

8

What is the physical state of the electrolyte in the extraction of aluminium?

Aqueous solution

Molten liquid

Solid

9

What are the electrode products in the extraction of aluminium?

Cathode = oxygen, anode = aluminium

Cathode = aluminium, anode = chlorine

Cathode = aluminium, anode = oxygen

10

Why is alumina (aluminium oxide) dissolved in molten cryolite?

To lower the temperature

To speed up the reaction

To increase the temperature