Electrolysis and Its Applications

What is the primary use of electrolysis?

• To produce sound waves

• To create magnetic fields

• To break down ionic compounds

• To generate electricity

Answer explanation

The primary use of electrolysis is to break down ionic compounds into their constituent elements through the passage of an electric current.

Which of the following products is NOT produced on a massive scale using electrolysis?

• Chlorine

• Sodium hydroxide

• Iron

• Aluminium

Answer explanation

Iron is not produced on a massive scale using electrolysis, unlike Chlorine, Sodium hydroxide, and Aluminium.

What is electroplating?

• Generating electricity from chemical reactions

• Breaking down ionic compounds using electricity

• Producing gases from liquids

• Putting a thin layer of metal onto another metal object

Answer explanation

Electroplating is the process of putting a thin layer of metal onto another metal object.

What type of electrodes are used in the experiment described in the text?

• Reactive electrodes

• Inert electrodes

• Magnetic electrodes

• Insulating electrodes

Answer explanation

The experiment described in the text uses inert electrodes, which are electrodes that do not chemically react during the experiment.

What is the purpose of using a direct current (DC) in the electrolysis experiment?

• To decrease the resistance

• To increase the voltage

• To allow current to flow in one direction only

• To allow current to flow in both directions

Answer explanation

To allow current to flow in one direction only

What is observed at the negative electrode during the electrolysis of copper sulfate solution?

• Bubbles appear

• A blue liquid forms

• A brown solid appears

• A white powder forms

Answer explanation

During the electrolysis of copper sulfate solution, a brown solid appears at the negative electrode.

Which ion reacts at the negative electrode in the copper sulfate solution?

• Hydrogen ion

• Sulfate ion

• Hydroxide ion

• Copper ion

Answer explanation

The copper ion reacts at the negative electrode in the copper sulfate solution.

What gas is produced at the positive electrode in the absence of halide ions?

• Hydrogen

• Nitrogen

• Oxygen

• Chlorine

Answer explanation

Oxygen is produced at the positive electrode in the absence of halide ions, making it the correct choice.

What is the term for the electrode where reduction occurs?

• Electrolyte

• Anode

• Conductor

• Cathode

Answer explanation

The term for the electrode where reduction occurs is the Cathode, making it the correct choice in this context.

What mnemonic helps remember the process of oxidation and reduction?

• LEO GER

• OIL RIG

• RED OX

• GAS LIQ

Answer explanation

The mnemonic 'OIL RIG' helps remember the process of oxidation (Oxidation Is Loss) and reduction (Reduction Is Gain), making it the correct choice.