Electrolysis IGCSE

What is the name given to the solution that is being electrolysed?

• Salt solution
• Electric solution
• Mineral solution
• Electrolyte

Explain why the electrolyte has to be a liquid.

• So the ions can move
• So the electrons can move
• So that it doesn't get too hot
• So the fish are ok

What particle carries the charge in the wire?

• electron

• proton

• ion

• atom

What are the electrode products when molten silver iodide is electrolysed between inert electrodes?

• A

• B

• C

• D

Copper and hydrogen can each be formed by electrolysis.

At which electrodes are these elements formed?

• A

• B

• C

• D

Which substance does NOT produce a gas at both electrodes during electrolysis?

• concentrated aqueous sodium chloride

• concentrated hydrochloric acid

• dilute sulfuric acid

• molten lead(II) bromide

The apparatus used for electrolysis is shown.

Which statement is correct?

• Copper forms at the anode in some electrolysis reactions.

• Hydrogen forms at the cathode in some electrolysis reactions.

• Oxygen forms at the cathode in some electrolysis reactions.

• The negative electrode is called the anode.

Three electrolysis cells are set up. Each cell has inert electrodes.

The electrolytes are listed below.

cell 1 aqueous sodium chloride

cell 2 dilute sulfuric acid

cell 3 molten lead(II) bromide

In which of these cells is a gas formed at both electrodes?

• 1 and 2

• 1 and 3

• 2 only

• 3 only

Using reactivity series of metals, which of the following metals is the least reactive ?

• Potassium

• Aluminium

• Iron

• Gold

Which metal could not be used for electroplating by using an aqueous solution?

• chromium

• copper

• silver

• sodium