Electrolysis - Jamb Chemistry Past Questions and Answers

Question 11:

• JAMB 1980

Copper sulphate solution was electrolysed using the apparatus show above. Which of the following changes are observed?

A. The bulb lights and copper is deposited at both electrodes
B. The bulb lights and copper is deposited at the anode and disappears from the cathode
C. The bulb lights and copper is deposited at the cathode and oxygen liberated at the anode
D. The bulb lights and copper is deposited at the cathode and disappears from the anode
E. The bulb lights but no additional changes are observed

Question 12:

• JAMB 1981

An example of a strong electrolyte is?

A. Ethyl acetate
B. Ethanol
C. Glucose
D. Sodium formate
E. Formic acid

Question 13:

• JAMB 1981

Which of the following processes takes place during electrolysis?

A. Positive ions are discharged at the anode bby gaining sufficient electrons to become neutral
B. Negative ions are dicharged at the anode by gaining suficient electrons to become neutral
C. Positive ions are discharged at the anode by losing sufficient electrons to become neutral
D. Negative ions are discharge at the anode by losing sufficient electrons to become neutral
E. Nothing happens

Question 14:

• JAMB 1982

Which of the following statements is correct during the electrolysis of a caustic soda solution using platinum electrodes?

A. Oxygen gas is given off at the cathode
B. Hydrogen gas is given of at the anode
C. Sodium metals is deposited at the anode
D. Sodium metal is deposited at the cathode
E. AAlkalinity at the cathode increases

Question 15:

• JAMB 1982

The product formed at the the cathode during the electrolysis of sodium chloride solution with carbon electrodes is?

A. Sodium
B. Chlorine
C. Hydrogen
D. Sodium hydroxide
E. Oxygen