Waec Chemistry 2000 Past Questions and Answers

Question 21:

• WAEC 2000

What type of reaction is involved when wood shavings produce a brown gas with concentrated HNO₃?

A. Redox reaction
B. Destructive distillation
C. Dehydration
D. Nutralization

Question 22:

• WAEC 2000

Chemical equilibrium is attained when

A. Reactants in the system are used up
B. Concentrations of the products are greater than those of the reactants
C. Concentrations of the reactants and products remain constant
D. Reactants stop forming the products

Question 23:

• WAEC 2000

What is the effect of using vanadium (V) oxide as catalyst in the reaction represented by the following equation? 2SO₂ + O₂ ⇌ 2SO₃; ∆H = - xKJmol-¹

A. Decreases the value of ∆H
B. Increases the collision rate of reactant particles
C. Shifts equilibrium position to the right
D. Reduces the time for attainment of equilibrium

Question 24:

• WAEC 2000

A finely divided from of a metal burns more readily in air than the rod from because the rod has

A. Higher molar mass
B. Smaller surface area
C. Protective oxide coating
D. Diferent chemical properties

Question 25:

• WAEC 2000

Which of the following will displace copper from a solution of copper (ll) salt?

A. Aluminium ions
B. Magnesium
C. Silver
D. Zinc ions