Waec Chemistry 2014 Past Questions and Answers

Question 26:

• WAEC 2014

The gases produced when Cu(NO₃)_2(s) was heated are

A. NO and NO₂
B. O₂ and NO
C. NO₂ and N₂O₄
D. O₂ and NO₂

Question 27:

• WAEC 2014

Which of the following salts on hydrolysis would give an alkaline solution?

A. NH₄CI_(s)
B. AICI_3(s)
C. CH₃COONa_(s)
D. NH₄NO_3(s)

Question 28:

• WAEC 2014

Consider the reaction represented by the following equation: Na₂CO_3(aq) + 2HCl_(aq) \(\longrightarrow\) 2NaCl_(aq) + H₂O_(l) + CO_2(g) . What volume of 0.02 mol dm^-3 Na₂CO_3(aq) would be required to completely neutralize 40 cm³ of 0.10 mol dm^-3 HCl_(aq)?

A. 200 cm³
B. 100 cm³
C. 40 cm³
D. 20 cm³

Question 29:

• WAEC 2014

Which of the following factors would affect the equilibrium constant?

A. Concentration
B. Temperature
C. Pressure
D. Volume

Question 30:

• WAEC 2014

Consider the reaction represented by the following equation: N_2(g) + 3H_2(g) ⇌ 2NH_{3(g)[sub]; ∆H^ϴ = -xkJ mol^-1. Which of the following conditions would increase the yield of NH[sub]3}?
[/sub][/sub]

A. Addition of iron catalyst
B. Increase in the temperature of the system
C. Increase in the volume occupied by reactants
D. Increase in the total pressure of the system