SG O Level Electrolysis 2 (basic)

In the electrolysis of molten sodium chloride, which reaction occurs at the cathode?

• 2 H⁺(l) + 2e^- → H₂(g)

• 2 Cl^-(l) → Cl₂(g) + 2e^-

• Na⁺(l) + e^- → Na(l)

• Na⁺(l) → Na(l) + e^-

• 2Cl^-(l) + 2e^-→ Cl₂(g)

In the electrolysis of molten sodium chloride, which reaction occurs at the anode?

• Na⁺(l) + e^- → Na(l)

• 2H⁺(l) + 2e^- → H₂(g)

• 2Cl^- (l) + 2e^- → Cl₂(g)

• 2Cl^- (l) → Cl₂(g) + 2e^-

• Na⁺ (l) → Na(l) + e^-

What is the expected observation at the anode during the electrolysis of molten sodium chloride?

• Pale green bubbles of gas

• Brown bubbles of gas

• Silvery metal deposited at the electrode

• Silvery metal settle at the bottom of electrolyte

• Colourless bubbles of gas

What is the expected observation at the cathode during the electrolysis of molten sodium chloride?

• Pale green bubbles of gas

• Brown bubbles of gas

• Colourless bubbles of gas

• Silvery liquid metal obtained at the electrode

• Silvery solid metal settles at the bottom of electrolyte

During the electrolysis of dilute hydrochloric acid using graphite electrodes, oxygen gas is produced at one of the electrodes. As a result, the graphite electrode must be replaced regularly. Which is the reason that explains the need for replacement?

• the oxygen produced will react with graphite to produce carbon monoxide

• the oxygen produced will dissolve in the solution

• the remaining hydrochloric acid will corrode the graphite electrodes

• the oxygen produced will react with graphite to produce carbon dioxide

In the electrolysis of dilute copper(II) sulfate solution using inert electrodes, what is the product formed at the anode?

In the electrolysis of dilute copper(II) sulfate solution using inert electrodes, what is the product formed at the cathode?

In the electrolysis of concentrated hydrochloric acid solution using inert electrodes, what is the product formed at the anode?

In the electrolysis of concentrated magnesium chloride solution using inert electrodes, what is the product formed at the cathode?

In the electrolysis of concentrated hydrochloric acid solution using inert electrodes, which is the correct ionic half equation formed at the anode?