Waec Chemistry 2017 Past Questions and Answers

Question 36:

• WAEC 2017

The property of a chemical reaction that is affected by the presence of a catalyst is

A. Activation energy
B. Free energy
C. Equilibrium position
D. Enthalpy change

Question 37:

• WAEC 2017

Soluble salts can be prepared by the following methods except

A. Neutralization
B. Reaction of an acid with trioxocarbonate(IV) salt
C. Double decomposition
D. Reaction of an acid with electropositive metals

Question 38:

• WAEC 2017

Chemical reactions occurs when the colliding reactants have energy that is

A. Less than the activation energy
B. Greater than the activation energy
C. Greater than the energy of the product
D. Less than the energy of effective collision

Question 39:

• WAEC 2017

The common feature of reactions at the anode is that

A. Electrons are consumed
B. Ions are reduced
C. Oxidation is involved
D. The electrode dissolves

Question 40:

• WAEC 2017

Consider the following reaction equation: \(2NO_{(g)} + O_{{2}{(g)}} \to 2NO_{{2}{(g)}}\). What is the change in the oxidation number of nitrogen?

A. +2 to 0
B. +2 to -2
C. +2 to +4
D. +4 to +2