Electrolysis - Jamb Chemistry Past Questions and Answers

Question 81:

• JAMB 2009

Which of the following metals is purified commercially by electrolysis?

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

Question 82:

• JAMB 2009

What current will deposit 3.25g of zinc in 2hrs?
[Zn = 65, F = 96500 mol^-]

A. 3.25A
B. 2.00A
C. 1.34A
D. 0.67A

Question 83:

• JAMB 2009

In the electrolytic extraction of aluminum, the function of the molten cryolite is to

A. Precipitate aluminium hdroxide
B. Lower the melting point of aluminium oxide
C. Act as a raw materials
D. Act as a solvent

Question 84:

• JAMB 2010

What quantity of aluminium is deposited when a current of 10A is passed through a solution of an aluminium salt for 1930s?
[Al = 27, F = 96500 C mol ^-1]

A. 0.2 g
B. 1.8 g
C. 5.4 g
D. 14.2 g

Question 85:

• JAMB 2011

The function of zinc electrode in a galvanic cells is that it

A. Undergoes reduction
B. Serves as the positive electrode
C. Production of electons
D. Uses up electrons