Waec Chemistry 1992 Past Questions and Answers

Question 26:

• WAEC 1992

The energy required to remove the most loosely bound electron from an atom in the gaseous state is known as the

A. Bond energy
B. Ionization energy
C. Potential energy
D. Activation energy
E. Kinetic energy

Question 27:

• WAEC 1992

Vulcanization of rubber

A. Stops the growth of fungus on the rubber
B. Increases the solubility of the rubber
C. Decreases the elasticity of the rubber
D. Hardnes the rubber through cross-linkage
E. Removes sulphur from the rubber

Question 28:

• WAEC 1992

If a reaction is said to be exothermic, which of the following statements is a correct deduction from the information?

A. The reaction vessel gets hotter as the reaction proceeds
B. ∆H for the reaction is positive
C. The rate of the reaction increases with time
D. The activation energy of the reaction is high
E. The rate of the reaction increases with time

Question 29:

• WAEC 1992

If a reaction is said to be exothermic, which of the following statements is a correct deduction from the information?

A. The reaction vessel gets hotter as the reaction proceeds
B. ∆H for the reaction is positive
C. The rate of the reaction increases with time
D. The activation energy of the reaction is high
E. The rate of the reaction increases with time

Question 30:

• WAEC 1992

Which of the following statement is not correct about esterification?

A. It is a slow reaction
B. The process is reversible
C. It is similar to hydrolysis
D. It is catalysed by acids
E. The products usually have a fruity smell