Electrolytic Cells

Diagram shows the electrolysis of concentrated copper(II) chloride solution using carbon as electrodes. Which of the following is the correct half-equation representing the reaction at anode?

• 4OH^- → 2H₂O + O₂ + 4e^-

• 2Cl^- → Cl₂ + 2e^-

• Cu → Cu²⁺ + 2e^-

• Cu²⁺ + 2e ^- → Cu

Answer explanation

Cl^- will be selectively discharged at anode due to high concentration of Cl^- ion compared to OH^- ion

Tags

NGSS.HS-PS1-2

Diagram shows electrolysis of dilute sulphuric acid. Identify gas X and the half-equation occurring at the cathode?

• Carbon dioxide, C + O₂ → CO₂

• Hydrogen, 2H⁺ + 2e^- →H₂

• Oxygen, 4OH^- → H₂O + O₂ + 4e-

• Sulphur dioxide, SO₄ ^2- → SO₂ + O₂ + 2e-

Answer explanation

H⁺ ion will be selectively discharged at cathode since its lower in the Electrochemical Series.

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4

Which one of the following statements is true for both galvanic cells and electrolytic cells?

• Reduction occurs at the negative electrode in both cells.

• Reduction occurs at the cathode in both cells.

• Anions migrate to the cathode in both cells.

• The anode is positive in both cells.

Answer explanation

Which of the following is the balanced half -reaction for the oxidation of Cu to Cu^+2?

• Cu → Cu²⁺

• Cu + 2e^- → Cu²⁺

• Cu → Cu²⁺ + 2 e^-

• Cu - 2e^- → Cu²⁺

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Molten X is electrolysed using carbon electrodes. After 10 minutes, a brown solid is deposited on the cathode and a brown gas is released at the anode. What is molten X?

• Lead(II) chloride

• Lead(II) bromide

• Copper(II) chloride

• Copper(II) bromide

Answer explanation

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In electrolytic cell, anode will attract...

• Cations

• Anions

Tags

NGSS.HS-PS2-5

What occurs during electrolysis of a molten salt?

• Electricity is produced by a spontaneous redox reaction

• Electricity cause a non-spontaneous redox reaction to occur

• Electrons flow through the molten salt

• Electrons are removed from both ions of the molten salt

Tags

NGSS.HS-PS1-2

A student decided to silver-plate a locker key using the apparatus shown. In this cell, the key is the

• anode and is connected to the positive terminal of the power supply

• anode and is connected to the negative terminal of the power supply

• cathode and is connected to the positive terminal of the power supply

• cathode and is connected to the negative terminal of the power supply

Tags

NGSS.HS-PS2-5

Electrical energy is converted to Chemical energy in ...

• A Galvanic/ Voltaic Cell

• A Electrolytic Cell

• Both Galvanic/Voltaic and Electrolytic cells

In an electrochemical cell, Which would be an accurate half-equation at the anode for aluminum?

• Al³⁺ + 3e^- --> Al

• Al --> Al³⁺ + 3e^-

• Al³⁺ --> Al + 3e^-

• Al + 3e^- --> Al³⁺