Electrolysis Quiz CSDA

Which of the following is the correct representation of the electrolysis of molten sodium chloride?

• Sodium is deposited at the cathode; chlorine gas is released at the anode.

• Chlorine gas is released at the cathode; sodium is deposited at the anode.

• Sodium is deposited at the anode; chlorine gas is released at the cathode.

• No reaction occurs during the electrolysis of molten sodium chloride.

During the electrolysis of aqueous copper(II) sulfate using copper electrodes, what happens at the cathode?

• Copper is deposited.

• Oxygen gas is released.

• Hydrogen gas is released.

• No reaction occurs.

In electroplating, which statement is correct?

• The object to be plated is made the anode.

• The object to be plated is made the cathode.

• The electrolyte is always an acid.

• Electroplating does not involve electrolysis.

Which ion migrates towards the cathode during electrolysis?

• Sulfate ion (SO₄²⁻)

• Hydroxide ion (OH⁻)

• Sodium ion (Na⁺)

• Chloride ion (Cl⁻)

What is the main product at the anode during the electrolysis of concentrated hydrochloric acid?

• Hydrogen gas

• Chlorine gas

• Oxygen gas

• Water

Which of the following metals is most likely to be extracted by electrolysis?

• Iron

• Copper

• Aluminum

• Silver

In the electrolysis of aqueous sodium chloride, which gas is produced at the cathode?

• Chlorine

• Oxygen

• Hydrogen

• Nitrogen

What is the purpose of using cryolite in the electrolysis of aluminum oxide?

• To act as a catalyst

• To lower the melting point of aluminum oxide

• To increase the electrical conductivity

• To prevent oxidation

During electrolysis, which species is reduced?

• The species that gains electrons

• The species that loses electrons

• The species that gains protons

• The species that loses protons

Which substance is commonly used as the electrolyte in the electrolysis of water?

• Sulfuric acid

• Sodium chloride

• Potassium hydroxide

• Calcium carbonate