Question

Why is chlorine gas a product of NaCl electrolysis?

A. The Cl- ions become oxidized at the cathode allowing them to form Cl2 molecules.
B. The Cl+ ions become reduced at the anode allowing them to form Cl2 molecules.
C. The Na+ ions react to the anode, releasing the Cl- ions with enough energy to change into a gas.

D. The Na- ions react to the cathode, releasing the Cl+ ions with enough energy to change into a gas.

Answer 1

Answer:

A. The Cl- ions become oxidized at the cathode allowing them to form Cl2 molecules.

Explanation:

At the anode in an electrolytic cell oxidation occurs.

In the electrolysis of NaCl, at the anode both Cl⁻ and OH⁻ migrates here.

Cl⁻ is preferentially discharged and it undergoes oxidation as shown below:

2Cl⁻ → Cl₂ + 2e⁻

We see a loss of electron and change in oxidation number of Cl from -1 to 0

Chlorine gas is liberated in this electrode.

Answer 2

Answer:

The Cl- ions become oxidized at the cathode allowing them to form Cl2 molecules.

Explanation:

Answer via Educere/ Founder's Education