Post Utme Chemistry Past Questions and Answers

Question 56:

Given the reaction at equilibrium: \(\mathrm{N}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \leftrightarrow 2 \mathrm{NO}(\mathrm{g})\) as the concentration of \(\mathrm{N}_{2}(\mathrm{~g})\) increases, the concentration of \(\mathrm{O}_{2}(\mathrm{~g})\) will ____________

A. Decrease
B. Increase
C. Remains the same
D. Vanishes
E. Pours away

Question 57:

If a reaction is exothermic and there is a great disorder, it means that ____________

A. The reaction is in a state of equilibrium
B. There will be a large increase in free energy
C. There will be a large decrease in free energy
D. The reaction is static

Question 58:

In the chemical reaction of \(A+B=C+D\), more of is formed ____________

A. If the concentration of \(A\) is reduced
B. If the concentration of \(B\) is reduced
C. If the concentration of \(C\) is reduced
D. If the concentration of \(C\) is increased
E. If it is continuously removed from the reaction mixture

Question 59:

In what way is equilibrium constant for the forward reaction related to that of the reverse reaction?

A. The addition of the two is expected to be one.
B. The product of two is expected to be one.
C. The two equilibrium constants are identical.
D. The product of the two is always greater than one.

Question 60:

In which reaction will the point of equilibrium shift to the left when the pressure on the system is increased?

A. \(\mathrm{C}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{~g}) \leftrightarrow \mathrm{CO}_{2}(\mathrm{~g})
B. \(\mathrm{CaCO}_{3}(\mathrm{~s}) \leftrightarrow \mathrm{CaO}(\mathrm{s})+\mathrm{CO}_{2}(\mathrm{~g})\)
C. \(2 \mathrm{Mg}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{~g}) \leftrightarrow\) \(2 \mathrm{MgO}(\mathrm{s})\)
D. \(2 \mathrm{H}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \leftrightarrow 2 \mathrm{H}_{2} \mathrm{O}(\mathrm{g})\)