Waec Chemistry 1996 Past Questions and Answers

Question 16:

• WAEC 1996

The rate of production of hydrogen gas from the reaction between zinc granules and hydrochloric acid can be increased by

A. Cooling the reaction mixture
B. Using zinc powder instead of zinc granules
C. Using zinc rod instead of zinc granules
D. Carrying out the reaction at a higher pressure
E. Carrying out the reaction in a closed vessel

Question 17:

• WAEC 1996

What does X represent in the following equation? H _2(g) + 1/2O_2(g) → H₂O _(l); ∆H = xKJ.

A. Bond energy
B. Activation energy
C. Ionization energy
D. Enthalpy of neutralization
E. Enthalpy of formation

Question 18:

• WAEC 1996

If the third member of a homologous series is C₃H₈, the fifth member will be

A. C ₅H₈
B. C₅H₉
C. C₅H₁₀
D. C₅H₁₁
E. C₅H₁₂

Question 19:

• WAEC 1996

Which of the following exhibits resonance?

A. Benzene
B. Butane
C. Pentene
D. Octana
E. Hexene

Question 20:

• WAEC 1996

On exposing palm wine to air for some days, it becomes sour owing to the conversion of

A. Glucose to ethanol
B. Glucose to gluconic acid
C. Ethanol to ethanoic acid
D. Ethanol to ethanal
E. Palm wine to palmitic acid