Electrolysis - Jamb Chemistry Past Questions and Answers

Question 36:

• JAMB 1992

Calculate the mass, in kilograms, of magnesium produced by the electrolysis of magnesium (II) chloride in a cell operating for 24 hours at 500 amperes.

A. 2.7
B. 5.4
C. 10.8
D. 21.7

Question 37:

• JAMB 1993

During the electrolysis of a salt of a metal M, a current of 0.5 A flows from for 32 minutes 10 seconds and deposits 0.325 g of M, What is the charge of the metal ion?
(M = 65, If = 96,500 C per mole of electron)

A. 1
B. 2
C. 3
D. 4

Question 38:

• JAMB 1993

Which of the reactions occurs at the anode during the electrolysis of a very dilute aqueous solution of sodium chloride?

A. OH^- - e → OH
B. CIsup>- - e → CI
C. OHsup>- + CIsup>-HCI + O₂
D. Na₊ - esup>- Hg (Na)/(Hg) amalgam

Question 39:

• JAMB 1993

Half-cell reaction. From the data above , it can be deduced that the most powerful reducing agent of the four metals is

A. Cu
B. Fe
C. Ba
D. Zn

Question 40:

• JAMB 1994

What volume of oxygen measured at s.t.p would be liberated on electrolysis by 9650 coulombs of electricity?
(Molar volume of gas = 22.4 dm³, F = 96,500 C mol^-)

A. 22.4 dm³
B. 11.2 dm³
C. 1.12 dm³
D. 0.560 dm³