Waec Chemistry 2009 Past Questions and Answers

Question 31:

• WAEC 2009

A solution that contains as much solute as it can dissolve at a given temperature is said to be

A. Concentrated
B. Saturated
C. Supersaturated
D. Unsaturated

Question 32:

• WAEC 2009

Which of the following salts is insoluble in water?

A. Pb (NO₃)₂
B. Na ₂CO₃
C. AgNO₃
D. AgCI.

Question 33:

• WAEC 2009

Which of the following statement is correct? The solubility of

A. Gases increases with increase in temperature
B. Gases decreases with increase in temperature
C. Most solid solutes decreases with indease in temperature
D. Most solid solutes is constant

Question 34:

• WAEC 2009

A catalyst increases the rate of chemical reaction by

A. Decreasing the temperature of the reaction
B. Decreasing the activation energy of the reaction
C. Increasing the surface area of the reactants
D. Decreasing the surface area of the products

Question 35:

• WAEC 2009

Which of the following factors will affect the rate of the reaction represented by the equation? 2HCI_(aq) + CaCO _3(s) → CaCI_2(aq) + H₂O _(I) + CO_2(g) l. Pressure ll. Concentration III. Nature of reactants IV. Temperature

A. L and ll only
B. Ll, lll and IV only
C. L, ll and lll only
D. L, ll, lll and IV