Post Utme Chemistry Past Questions and Answers

Question 41:

Which is a property of a reaction that has reached equilibrium?

A. The amount of products is greater than the amount of reactants.
B. The amount of products is equal to the amount of reactants.
C. The rate of the forward reaction is greater than the rate of the reverse reaction.
D. The rate of the forward reaction is equal to the rate of the reverse reaction

Question 42:

Which of the following combination of conditions many increase the rate of a chemical reaction.

A. Decrease in temperature, increase in concentration of the reactant
B. Increase in temperature, addition of a catalyst, decrease in the surface area of the reactant
C. Increase in temperature, increase in concentration, addition of a catalyst and increase in the surface area of the reactant
D. Decrease in temperature, concentration and surface area of the reactants
E. Addition of catalyst and in the absence of light.

Question 43:

"Quicklime" has the formula ____________

A. \(\mathrm{Ca}(\mathrm{OH})_{2}\)
B. \(\mathrm{CaO}\)
C. \(\mathrm{CaCO}_{3}\)
D. \(\mathrm{CaSO}_{4} 2 \mathrm{H}_{2} \mathrm{O}\)
E. \(\mathrm{CaCl}_{2}\)

Question 44:

A Transition metal is different from a non-transition metal because ____________

A. It has an octet configuration
B. It is very stable
C. It is coloured
D. It has incomplete outer shell d-electrons
E. It has no electron in the d-orbital.

Question 45:

Chlorine is produced commercially by ____________

A. Electrolysis of dilute \(\mathrm{HCl}\)
B. Electrolysis of brine
C. Neutralization of \(\mathrm{HCl}\)
D. Heating potassium trioxochlorate \((\mathrm{V})\)
E. Action of dilute mineral acids on bleaching powder