Electrolysis

Which of these is an anion?

• Cl^-

• Cl₂

• Na

• Na⁺

Which of these is a cation?

• Cl^-

• Cl₂

• Na

• Na⁺

A solution which conducts electricity is called...

• electrode

• anion

• electrolyte

• cathode

The negative electrode is called...

• anion

• cation

• anode

• cathode

Which ions are present in molten magnesium bromide?

• Mg⁺ and Br^-

• Mg²⁺ and Br^-

• Mg²⁺ and Br2^-

• Mg²⁺ and Br^2-

What are the products when molten sodium oxide is electrolysed?

• Na₂ and O₂

• Na⁺ and O^2-

• Na and O

• Na and O₂

Which process could happen at the cathode?

• Na⁺ + e^- → Na

• 2 O^2- → O₂ + 4 e^-

Which process could happen at the anode?

• Na⁺ + e^- → Na

• 2 O^2- → O₂ + 4 e^-

Which ions are present in sodium chloride solution?

• Na⁺ and Cl^- only

• Na and Cl₂

• Na⁺, Cl^-, H⁺ and OH^-

• Na, Cl₂ and H₂O

Sodium is higher than lead in the reactivity series. If both sodium and lead cations were present in a solution, which would discharge at the cathode?

• Sodium

• Lead