Waec Chemistry 2008 Past Questions and Answers

Question 21:

• WAEC 2008

The collision theory proposes that

A. Reactants collide more frequently to bring about reduction in the reaction rate
B. All collisions of reactants are effective
C. Reactants must collide with a certain minimum amount of energy to from products
D. The fewer the collisions the faster the reaction rate

Question 22:

• WAEC 2008

Diamond does not conduct electricity because it

A. Has no free valence electrons
B. Is a giant molecule
C. Contains no bonded electrons
D. Is a solid at room temperature

Question 23:

• WAEC 2008

Which of the following set of equations could be used to represent the standard enthalpy of formation of glucose?

A. 6C _(s) + 6H _2(g) + 3O_2(g) → C ₆H₁₂O_6(s)
B. 6CO_2(g) + 6H₂O _(l) → C₆H₁₂O_6(s) + 6O _2(g)
C. 6C_(g) + 6H _2(g) + 3O_2(g) → C₆H₁₂O _6(s)
D. 6C_(g) + 6H _2(g) + 3O_2(g) → C ₆H ₁₂O _6(aq)

Question 24:

• WAEC 2008

The colour of phenolphthalein indicator in dilute HNO is

A. Colourless
B. Orange
C. Pink
D. Purple

Question 25:

• WAEC 2008

An aqueous solution of CaCI₂ is

A. Acidic solution
B. Alkaline solution
C. A buffer solution
D. A neutral solution