WAEC Chemistry Past Questions & Answers - Page 84

416.

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

Correct answer is B

All others except pressure would affect the equilibrium of the system.

417.

Chemical equilibrium is attained when

A.

All the reactants have been completely used up

B.

The reaction goes to completion

C.

The concentration of reactants and products remain constant

D.

The concentration of reactants and products are equal

Correct answer is C

No explanation has been provided for this answer.

418.

The refreshing characteristic taste of fizzy drinks is due ot the presence of

A.

Carbon(IV)oxide

B.

Glucose

C.

Hydrogen

D.

Sodium Citrate

Correct answer is A

No explanation has been provided for this answer.

419.

Consider the following reaction equation
H3O+(aq) + OH(aq) \(\rightarrow\) 2H2O(1)
The reaction represents

A.

Esterification

B.

Hydrolysis

C.

Neutralization

D.

Redox

Correct answer is C

No explanation has been provided for this answer.

420.

The pH of four solutions M,N,Q and R are 2,6,8 and 11 respectively.
Which of the following deductions about the solutions is correct?

A.

The pH of N is increased when the solution is diluted

B.

The pH of Q is increased when the solution is evaporated

C.

M is the most alkaline solution

D.

R is the most acidic solution

Correct answer is A

No explanation has been provided for this answer.