Chemistry 2016 Waec Past Questions and Answers

Question 31 :

• WAEC 2016

Which of the following factors will affect the rate of the reaction represented by the following equation?
2HCl(aq) + CaCO3(s) \(\rightarrow\) CaCl2(aq) + H2O(1) + CO2(g)
I. Pressure
II.Concentration
III. Nature of reactants
IV. Temperature

A. I and II only
B. II, III and IV only
C. I, II and III only
D. I, II. III and IV

Question 32 :

• WAEC 2016

On evaporation to dryness, 350³ of saturated solution of salt Z gave 55.5g of salt. What is the solubility of the salt? [Z = 101]

A. 1.57 moldm^-3
B. 3.14 moldm^-3
C. 6.28 moldm^-3
D. 12.56 moldm^-3

Question 33 :

• WAEC 2016

Which of the following salts when dissolved in water will form a solution that will change blue litmus to red?

A. CH₃COONa
B. NH₄Cl
C. NaCl
D. KCl

Question 34 :

• WAEC 2016

Which of the following bonds are broken when ethanol is boiled?
I. Covalent bonds
II. Ionic bonds
III. Hydrogen bonds

A. I only
B. II only
C. III only
D. I, II, III

Question 35 :

• WAEC 2016

A compound with molecular formula CH₂O₂ is

A. A Carbohydrate
B. A Carboxylic acid
C. An alkanol
D. An ester