Post Utme Federal University of Technology, Akure Chemistry Past Questions and Answers

Question 11:

What is the amount (in mode) of hydrogen gas that would be produced if \(0.6\) mole of hydrochloric acid reacted with excess zinc according to the following equation? \(\quad \mathrm{Zn}_{\mathrm{w}}+2 \mathrm{HCl}_{\text {wet }} \quad \mathrm{ZnCl} \mathrm{nes} \mathrm{}_{\text {mat }}+\mathrm{H},\)

A. 0.1 mole
B. 0.2 mole
C. 0.3 mole
D. 1.0 mole.

Question 12:

Chlorine is prepared on a large scale by the ____________

A. Electrolysis of concentrated sodium chloride solution.
B. Action of manganese (IV) oxide on hot concentrated hydrochloric acid.
C. Action of concentrated tetraoxosulphate (V) acid on sodium chloride, k
D. Oxidation of concentrated hydrochloric acid with potassium tetraoxomanganate (VII)

Question 13:

Which of the following statements is correct about the following system at equilibrium? \(P C L_{\text {iel }}\) \(\mathrm{PCl}_{\text {ice }}+\mathrm{Cl}_{\text {wal }} \Delta \mathrm{H}\) positive ____________

A. Increase in temperature increases the yield of \(\mathrm{PCl}, \)
B. \(\mathrm{PCl}\), is less stableat high pressures.
C. The concentrations of \(\mathrm{PCl}_{1}\) and \(\mathrm{Cl}_{4}\) increase at higher pressures. \(\quad\)
D. Decrease In pressure favours the forward reaction.

Question 14:

Isotopes of a given element have the same ____________

A. Neutron
B. Atomic numbe
C. Chemical properties.

Question 15:

Which of the following statements is correct about catalysts?
They ____________

A. Alter the rate of chemical reactions
B. Are generally specific in action.
C. Remain changed chemically at the end of the reaction.
D. Shift the equilibrium position in a reversible reaction.