The relationship between the pressure, \(P\), and the volume, \(V\), of a fixed amount of gas at a constant temperature is investigated experimentally. Which statements are correct?

I.     A graph of \(V\) against \(P\) will be a curve (non-linear).

II.     A graph of \(V\) against \(\frac{1}{P}\) will be linear.

III.     \(V = {\text{constant}} \times \frac{{\text{1}}}{P}\)

A.     I and II only

B.     I and III only

C.     II and III only

D.     I, II and III

D

One respondent stated that this question was not suitable for Topic 11. It is true that this MCQ on Topic 10 often does in fact test the AS‘s associated with Topics 11.1 and 11.2. However, Topic 11.3 on Graphical Techniques also is an integral part of Topic 11 and this question in fact links Topic 11.3 explicitly with the pressure-volume relationship from Topic 1.4, so is a completely suitable question for assessing this Topic 11.3, as candidates are required to interpret graphical behaviour. The question was found to be quite challenging for candidates with 40.98% of candidates getting the correct answer D.