Chemistry Mock Exam: Multiple-Choice

What name is given to a positive charged particle?

• Anion

• Cation

• Atom

Why does solid lead bromide not conduct electricity?

• It has no ions in it

• There are no delocalised electrons that are able to move

• The ions are fixed in place and cannot move

If electricity is passed through molten lead bromide, what happens?

• It splits into lead and bromine

• It catches on fire

• Nothing

If electricity is passed through molten zinc chloride, what happens?

• Zinc is formed at the cathode and chloride at the anode

• Zinc is formed at the anode and chloride at the cathode

• Hydrogen is formed at the cathode and oxygen is formed at the anode

In the electrolysis of zinc chloride, which is the correct half equation for the negative electrode (cathode)?

• 2Br^- → Br₂ + 2e^-

• Zn²⁺ + 2e^- → Zn

• Zn → Zn²⁺ + 2e^-

What is produced when concentrated aqueous copper chloride is electrolysed?

• Copper at the cathode and chlorine at the anode

• Hydrogen at the cathode and chlorine at the anode

• Copper at the cathode and oxygen at the anode

What is produced when concentrated aqueous sodium chloride is electrolysed?

• Sodium at the cathode and chlorine at the anode

• Hydrogen at the cathode and chlorine at the anode

• Hydrogen at the cathode and oxygen at the anode

What is one 'faraday'?

• One coulomb of charge

• One gram of electrons

• One mole of electrons

Which of the options could be used as an electrolyte when purifiying copper?

• Copper sulfate

• Lead nitrate

• Distilled water

Which half equation shows what happens at the negative electrode when purifying copper by electrolysis?

• Cu²⁺ + 2e^- →Cu

• Cu²⁺ → Cu + 2e^-

• Cu → Cu²⁺ + 2e^-