February/March 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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12Dynamic Equilibria Equilibrium ConstantsHard1 mark
In an industrial process, two gases X and Y react together to form a single gaseous product Z.
The equilibrium percentage of product Z varies according to the pressure and the temperature as shown in the graphs.
a graph of the equilibrium percentage of product Z (0-100%) against pressure (25-400 atm), plotted as five curves, one for each of 373 K, 473 K, 573 K, 673 K and 773 K; all curves rise with pressure, and the lower-temperature curves sit above the higher-temperature curves at every pressure
Which statement about this equilibrium reaction is correct?