Waec Chemistry 2014 Past Questions and Answers

Question 16:

• WAEC 2014

The oxidation number of sulphur in Fe₂(SO₄)₃ is

A. +2.
B. +3
C. +4.
D. +6.

Question 17:

• WAEC 2014

If 0.20 mol dm^-3 NaOH_(aq) was evaporated to yield 5.0g of solid NaOH, calculate the volume of NaOH _(aq) used. (Na = 23.0,O = 16:0; H = 1.00)

A. 600cm-³
B. 625cm³
C. 1000³
D. 1600 cm ³

Question 18:

• WAEC 2014

The mass of 800cm³ of gas Q at s.t.p. is 1.0g. What is the molar mass of Q? [Avogadros constant = 22.4dm³ mol^-1`]

A. 18.0 gmol^-1
B. 22,4gmol^-1
C. 28.0gmol^-1
D. 36.0 gmol^-1

Question 19:

• WAEC 2014

Which of the following statements about a chemical system in equilibrium is correct/ The

A. Reaction is irreversible
B. Reaction goes to completion
C. Equilibrium is re-established when a stress is applied
D. Equilibrium position is affected by catalyst

Question 20:

• WAEC 2014

Which of the following relationships correctly expresses the Boyle's law?

A. P \(\alpha\) V at constant T
B. V \(\alpha\) T at constant P
C. P \(\alpha\) \(\frac{1}{V}\) at constant T
D. V \(\alpha\) \(\frac{1}{T}\) at constant P