Chemistry 2012 Waec Past Questions and Answers

Question 31 :

• WAEC 2012

Which of the following pH values indicates that a solution is a strong base?

A. 1
B. 5
C. 9
D. 13

Question 32 :

• WAEC 2012

The hydrolysis of NH\(_4\)CI gives

A. An acidic solution
B. An alkaline solution
C. A buffer solution
D. A neutral solution

Question 33 :

• WAEC 2012

A spot of oil paint on a shirt can best be removed using

A. Brine
B. Detergent
C. Kerosine
D. Warm water

Question 34 :

• WAEC 2012

Consider the reaction represented by the following equation: CuO\(_{(s)}\) + H\(_2\)SO\(_{4(aq)}\) → CuSO\(_{4(aq)}\) + H\(_2\)O\(_{(l)}\). Which of the following factors will not affect the rate of the reaction?

A. Particle size of CuO_(s)
B. Concentration of H₂SO_4(aq)
C. Temperature of the reacting mixture
D. Pressure of reaction system

Question 35 :

• WAEC 2012

Which of the following devices function on redox reaction? l. Dry cell ll. Car battery III. Electric generator

A. L and lll only
B. Ll and lll only
C. L and ll only
D. L, ll and lll