Electrolysis - Chemistry Jamb Past Questions and Answers

Question 31 :

• JAMB 1989

A metal is extracted from its ore by the electrolysis of its molten chloride and it displaces lead from lead (ll) trioxonitrate (V) solution. The metal is

A. Copper
B. Aluminium
C. Zinc
D. Sodium

Question 32 :

• JAMB 1989

A metal is extracted from its ore by the electrolysis of its molten chloride and it displaces lead from lead (ll) trioxonitrate (V) solution. The metal is

A. Copper
B. Aluminium
C. Zinc
D. Sodium

Question 33 :

• JAMB 1990

Iron galvanized with zinc is cathodically protected from corrosion. This is because?

A. Zinc has a more positive oxidation potential than iron
B. Zinc has less positive oxidation potential than iron
C. Bith have the same oxidation potential
D. Zinc is harder than iron

Question 34 :

• JAMB 1990

The major component of the slag from the production of iron is?

A. An alloy of calcium and iron
B. Coke
C. Impure iron
D. Calcium trioxosilicate (IV)

Question 35 :

• JAMB 1991

If a current of 1.5 A is passed for 4.00 hours through a molten tin salt and 13.3g of tin is deposited, what is the oxidation state of the metal in the salt?
(Sn = 118.7, F = 96500 C mol^-1)

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