Electrolysis - Jamb Chemistry Past Questions and Answers

Question 71:

• JAMB 2006

The solution that will conduct the highest amount of electricity is

A. 0.5 mol dm^-3 of hydrochloric acid
B. 2.0 mol dm^-3 of hydrochloric acid
C. 0.5 mol dm^-3 ethanoic acid
D. 2.0 mol dm^-3 ethanoic acid

Question 72:

• JAMB 2006

In the electrolysis of CuSO_4(g) using platinum electrodes, the reaction at the anode is

A. 4H⁺ + 4e^- → 2H₂
B. 4OH^- - 4e^- → 2H₂O + O₂
C. 2OH - 2e^- → 2OH
D. 2OH^- + 2OH^- → 2H₂O + O₂

Question 73:

• JAMB 2007

The reaction that takes place in Daniell cell is

A. Direct combination
B. Redox
C. Double decomposition
D. Neutralization

Question 74:

• JAMB 2007

What happens when zinc rod is immersed in copper (II) tetraoxosulphate (VI) solution/

A. The blue colour of the solution disappears
B. Electrons flow from copper to zinc
C. The zinc rod remain undissolved
D. The copper generate more copper ions

Question 75:

• JAMB 2007

How long would it take to deposit 0.08g of copper from CuCl₂ solution by passing a current of 0.5A?
[Cu = 64, F = 96500 C mol_-1]

A. 6 mins
B. 8 mins
C. 24 mins
D. 48 mins