1

The diagram below shows a graph comparing the solubilities of three different salts, P, Q and R, in water.

Which of the following statements is true?

    • The solubility of R increases the most quickly with the decrease in temperature.
    • The three salts have different solubilities at all temperatures.
    • P and Q have the same solubility at 50°C.
    • The solubility of P is not influenced by temperature.