Electrolysis - Jamb Chemistry Past Questions and Answers

Question 56:

• JAMB 1999

Which of the following statement is true of the electrochemical series?

A. Electropositivity of metals increase down the series
B. Electropositivity of non-metals decrease down the series
C. Electronegativity of non-metals decrease down the series
D. Electropositivity of metals decreases down the series

Question 57:

• JAMB 1999

The pair of metals in the reactivity series that are usually extracted by the electrolysis of their ores is

A. Magnesium and zinc
B. Magnesium and calcium
C. Copper and zinc
D. Lead and calcium

Question 58:

• JAMB 2000

The knowledge of half-life can be used to

A. Create an element
B. Detect an element
C. Split an element
D. Irradiate an element

Question 59:

• JAMB 2000

Given that M is the mass of substance deposited in an electrolysis and Q the quantity of electricity consumed, then Faraday's law can be written as

A. M = Z/Q
B. M = Q/Z
C. M = Z/2Q
D. M = QZ

Question 60:

• JAMB 2001

What current in amperes will deposit 2.7g of aluminium in 2 hours?
[Al = 27, F = 96 500 C mol^-1]

A. 32
B. 8
C. 4
D. 16