Stogs GCSE Interleaving Electrolysis M

In electrolysis, the electrolyte must be a...

• solid.

• liquid.

• gas.

Why is cryolite used during the production of aluminium from its oxide by electrolysis?

• It lowers the melting point of aluminium oxide.

• It increases the melting point of aluminium.

• It increases the temperature.

In electrolysis, at the negative electrode, positively charged ions...

• lose electrons.

• gain electrons.

• dissolve.

Look at the equation: X⁺ + e^- → X. Is this oxidation or reduction?

• Oxidation

• Reduction

A student carried out electrolysis on copper sulphate (CuSO₄) solution. Which ions are attracted to the anode?

• Copper ions and hydrogen ions.

• Oxygen ions and sulphur ions.

• Hydrogen ions and hydroxide ions.

• Sulphate ions and hydroxide ions.

What is formed at the anode from the electrolysis of molten lead bromide?

• Lead

• Oxygen

• Hydrogen

• Bromine

What is formed at the cathode from the electrolysis of molten zinc chloride?

• Zinc

• Chlorine

• Hydrogen

• Oxygen

What is formed at the cathode from the electrolysis of molten sodium iodide?

• Sodium

• Iodine

• Oxygen

• Hydrogen

Positive ions move towards the negative electrode. Does oxidation or reduction then occur at this electrode?

• Oxidation

• Reduction

What type of bonding is present in compounds that can be electrolysed?

• Covalent

• Ionic

• Metallic

• Hydrogenic