Which factors will increase the entropy of this system?

\[{\text{CaC}}{{\text{O}}_{\text{3}}}{\text{(s)}} \rightleftharpoons {\text{CaO(s)}} + {\text{C}}{{\text{O}}_{\text{2}}}{\text{(g)}}\]

I.     Increasing the temperature without changing the volume of the container.

II.     Decreasing the concentration of the gas without changing the volume of the container.

III.     Increasing the pressure without changing the volume of the container.

A.     I and II only

B.     I and III only

C.     II and III only

D.     I, II and III

A

There were three G2 comments on this question which asked candidates to ascertain which factors would increase the entropy of a given system. All three comments suggested that the wording of the question could have been clearer. 45% of candidates got the correct answer.