Waec Chemistry 2008 Past Questions and Answers

Question 26:

• WAEC 2008

Which of the following compounds would dissolved in water to give a solution whose pH is less than 7?

A. AI(NO₃)₃
B. KNO₃
C. N₂O
D. NH₃

Question 27:

• WAEC 2008

Consider the reaction represented by the question below: KOH_(aq) + HCI_(aq) → KCI_(aq) + H₂O_(l) What volume of 0.25 mol dm^-3 KOH would be required to completely neutralize 40 cm³ of 0.10 mol dm ^-3 HCI?

A. 40 cm³
B. 32cm³
C. 24cm³
D. 16cm³

Question 28:

• WAEC 2008

When 100 cm³ of a saturated solution of KCIO₃ at 40^oC is evaporated, 14 g of the salt is recovered what is the solubility of KCIO₃ at 40^oC? [KCIO₃ = 122.5]

A. 11.42 mol dm^-3
B. 8.80 mol dm^-3
C. 1. 14 mol dm^-3
D. 0.88 mol dm^-3

Question 29:

• WAEC 2008

The high solubility of ethanol in water is due to its

A. Low boiling point
B. Low freezing point
C. Covalent nature
D. Hydrogen bonding

Question 30:

• WAEC 2008

Consider the equilibrium reaction represented by the equation: 2SO_2(g) + O_2(g) ⇌ 2SO_3(g) ∆H = - 197 kJmol^-1. At equilibrium, increase in the total pressure of the system brings about

A. Decrease in rate of the reaction of the system
B. Decrease in temperature of the system
C. Increase in temperature of SO₃
D. Increase in concentration of SO₂