Waec Chemistry 2001 Past Questions and Answers

Question 16:

• WAEC 2001

It can be concluded that gastric juice

A. Contains enzymes
B. Is acidic
C. Is a mixture
D. Has pH value of 7

Question 17:

• WAEC 2001

What does ∆H represent in the following equation ? Cl_(g) + e- → CI- _(g); ∆H = - 363 kJ mol-¹

A. Lonization energy
B. Electron affinity
C. Dissociation energy
D. Heat of atomization

Question 18:

• WAEC 2001

Consider the following equation: Ag⁺_(aq) + CI-_(aq) → Ag⁺CI- _(s) ; ∆H = _65.7 kJmol^-1. From the equation, it can be deduced that

A. Direct combination is involved and the reaction is endothermic
B. A solid is formed and heat is evolved
C. Activation energy is high and a catalyst is required
D. The reaction is endothermic and occurs at high temperature

Question 19:

• WAEC 2001

A reaction is represented by the equation below. A_2(g) + B_2(g) 2AB_(g); ∆H = +X kJmol^-1 Which of the following statements about the system is correct?

A. The reaction goes to completion at equilibrium
B. The forward reaction is exthermic
C. At equilibrium increase in temperature favours the reverse reaction
D. Pressure has no effect on the equilibrium mixture

Question 20:

• WAEC 2001

What is the oxidation number of nitrogen in AI(NO₃)₃?

A. + 1
B. + 3
C. + 5
D. + 6