Chemistry Practice Test – Chemical Equilibrium (Questions with Answers and Explanations)

When at equilibrium, which of the reactions below will shift to the right if the pressure is increased and the temperature is kept constant? (JAMB 2003)

A. 2H_2(g) + O_2(g)  2H₂O_(g)
B. 2NO_(g)  N_2(g) + O_2(g)
C. 2CO_2(g)  2CO_(g) + O_2(g)
D. 2SO_3(g)  2SO_2(g) + O_2(g)

The equilibrium of an endothermic reaction which the evolution of oxygen with time in the equation proceeds with an increase in volume be shifted in the reverse direction by _____ (JAMB 2009)

A. increasing the temperature decreasing the pressure
B. increasing the pressure and decreasing the temperature
C. decreasing the temperature and increasing the pressure
D. decreasing the pressure and decreasing the temperature.

Dynamic equilibrium describes a situation where ______ (JAMB 2006)

A. a reaction gives back the reactants
B. reactants are converted to products
C. the concentration of reactants and products is equal
D. both forward and reverse reactions proceed at the same rate.