Waec Chemistry 2014 Past Questions and Answers

Question 31:

• WAEC 2014

The reaction that occurs all the anode when CuSO_4(aq) is electrolyzed using carbon electrode is

A. 2H ^-_(aq) + 2e → H _2(g)
B. Cu²⁺_(aq) + 2e → Cu _(s)
C. 4OH _(aq)-4e → 2H₂O_(l) + O2 _(g)
D. SO_4(aq)²_-2e → SO _2(g) + O_2(g)

Question 32:

• WAEC 2014

Reduction is the process of

A. Loss of electron
B. Loss of hydrogen
C. Loss of oxygen
D. Addition of electronegative elements

Question 33:

• WAEC 2014

Ethene molecules can be added to one another to form a long chain compound called a

A. Dimer
B. Monomer
C. Polymer
D. Trimer

Question 34:

• WAEC 2014

Which of the following compounds determines the octane rating of petrol?

A. 1,2,3 - trimethyl pentane
B. 2,3,5 - trimethyl octane
C. 2,3,5 - trimethyl pentane
D. 2,2,4 - trimethyl pentane

Question 35:

• WAEC 2014

Which type of reaction is illustrated by the following equation? C₁₂H₂₆ → 5C ₂H₄ + C ₂H₆

A. Addition
B. Cracking
C. Hydrogenation
D. Polymerization