Waec Chemistry 2010 Past Questions and Answers

Question 11:

• WAEC 2010

The bonds in crystalline ammonium chloride are

A. Covalent and dative
B. Ionic and covalent
C. Ionic covalent and dative
D. Ionic covalent and hydrogen bond

Question 12:

• WAEC 2010

Consider the neutralization reaction represented by the following equation: Na2CO3 + 2HNO 3 → 2NaNO3 + H2O + CO2 The stoichiometric ratio of acid to base is

A. 2:2
B. 2:1
C. 1:2
D. 1:1

Question 13:

• WAEC 2010

A solution of sodium trioxocarbonate (IV) contains 10.6g in 250cm³ of solution. Calculate the concentration of the solution. [Na₂CO₃ = 106.0]

A. 0.4 mol dm^-3
B. 1.0 mol dm^-3
C. 10.6 mol dm^-3
D. 25.0 mol dm^-3

Question 14:

• WAEC 2010

What is the volume occupied by 2 moles of ammonia at s.t.p?

A. 44.8 dm^-3
B. 22.4 dm^-3
C. 11.2 dm^-3
D. 5.6 dm^-3

Question 15:

• WAEC 2010

Which of the following apparatuses can be used to measure accurately a specific volume of a liquid?

A. Beaker
B. Conical flask
C. Measuring cylinder
D. Pipette