Electrolysis - Jamb Chemistry Past Questions and Answers

Question 61:

• JAMB 2001

As the concentration of an electrolyte reduces, the conductivity

A. Reduces to zero
B. Decreases
C. Increase
D. Is unaffected

Question 62:

• JAMB 2002

The product of the electrolysis of dilute sodium hydroxide using platinum electrodes are

A. Hydrogen and oxygen gases
B. Water and hydrogen gas
C. Water and sodium metal
D. Sodium metal and oxygen gas

Question 63:

• JAMB 2003

When cathode rays are deflected onto the electrode of an electrometer, the instrument becomes

A. Negatively charged
B. Positvely charged
C. Neutral
D. Bipolar

Question 64:

• JAMB 2003

The commonest feature of reactions at the anode is that

A. Electrons are consumed
B. Oxidation is involved
C. Ions are reduced
D. Electrode dissolves

Question 65:

• JAMB 2003

In the electrolysis of a concentrated solution of sodium chloride using electrodes, which of the following ions are discharged at the cathode and anode respectively?

A. Na⁺ and Cl^-
B. Na⁺ and OH^-
C. H⁺ and OH^-
D. H⁺ and Cl^-