MCQ Quiz: C4 Electrochemistry

What is electrolysis?

• Combination of elements

• Decomposition of an ionic compound by heat

• Decomposition of an ionic compound using electric current

• Separation of mixtures by evaporation

In electrolysis, which of the following is true about the anode?

• It is the negative electrode

• It is the positive electrode

• It does not conduct electricity

• It attracts cations

The cathode is:

• The positive electrode

• The place where oxidation occurs

• The negative electrode

• Not involved in electrolysis

What is the electrolyte in electrolysis?

• The electrode

• The external circuit

• The solution that undergoes electrolysis

• The power source

During electrolysis of molten lead(II) bromide, what is formed at the cathode?

• Bromine gas

• Lead metal

• Hydrogen gas

• Oxygen gas

What is observed at the anode during electrolysis of molten lead(II) bromide?

• A grey solid forms

• Bubbles of hydrogen gas

• Brown fumes of bromine gas

• A blue solution

Which gas is formed at the anode during electrolysis of concentrated sodium chloride solution?

• Oxygen

• Hydrogen

• Chlorine

• Carbon dioxide

What is formed at the cathode during electrolysis of dilute sulfuric acid?

• Sulfur

• Oxygen

• Hydrogen

• Carbon

Which observation is correct during electrolysis of dilute sulfuric acid?

• Blue solution forms

• Bubbles of hydrogen at anode

• Bubbles of hydrogen at cathode

• Brown fumes at cathode

Where do electrons move in the external circuit?

• From anode to cathode

• From cathode to anode

• From solution to electrode

• From electrolyte to battery