iGCSE Electrolysis - easy/medium questions

What is the name of a positively charged ion?

• positron
• proton
• cation
• anion

A student was investigating the electrolysis of zinc chloride. What is the correct reason for electrolysis not working?

• Solid zinc chloride has been used

• The electrodes don't conduct electricity

• The power supply is not connected properly

• The crucible is too small to allow ions to flow

Solid lead(II) bromide is heated until it is molten. The molten lead (II) bromide then undergoes electrolysis. Which substances are formed at each electrode?

• anode: bromine, cathode: lead

• anode: lead, cathode: bromine

• anode: bromine, cathode: hydrogen

• anode: hydrogen, cathode: lead

The electrolysis of concentrated hydrochloric acid is shown. Which statement describes what happens to the electrons during the electrolysis?

• They are added to chloride ions.

• They are added to hydrogen ions.

• They move through the circuit from negative to positive.

• They move through the solution from negative to positive.

Which statement about electrolysis is correct?

• A. Electrons move through the electrolyte from the cathode to the anode.

• B. Electrons move towards the cathode in the external circuit.

• C. Negative ions move towards the anode in the external circuit.

• D. Positive ions move through the electrolyte towards the anode during electrolysis.

Dilute sulfuric acid is electrolysed using inert electrodes. What are the products of this electrolysis?

• A. cathode: oxygen, anode: sulfur

• B. cathode: hydrogen, anode: sulfur dioxide

• C. cathode: oxygen, anode: hydrogen

• D. cathode: hydrogen, anode: oxygen

Electricity is passed through concentrated aqueous sodium chloride. Inert electrodes are used. (Refer to the diagram of the electrolysis setup.) Which products are formed at the electrodes?

• A. cathode: hydrogen, anode: chlorine

• B. cathode: hydrogen, anode: oxygen

• C. cathode: sodium, anode: chlorine

• D. cathode: sodium, anode: oxygen

Based on the diagram and the information provided, what gas is formed at the cathode during the electrolysis of brine?

• Oxygen

• Chlorine

• Hydrogen

• Sodium

According to the information and diagram, which ion is discharged at the anode in the electrolysis of concentrated sodium chloride solution?

• OH⁻

• Cl⁻

• Na⁺

• NO₃⁻

The diagram shows the electrolysis of aqueous copper(II) sulfate. Which statement is correct?

• Copper metal is deposited at the positive electrode.

• In the external circuit the electrons move from negative to positive.

• In the solution the electrons move from positive to negative.

• Oxygen gas is produced at the positive electrode.