A Levels Chemistry

In an industrial process, two gases X and Y react together to form a single gaseous product Z.
X(g) + Y(g)= Z(g)
The percentage yield of product Z varies according to the pressure and the temperature as
shown in the graphs.
100-
373 K
473 K
90-
80-
573 K
70-
673 K
60-
equilibrium % of Z
50-
40-
30-
773 K
20-
10-
25 100 200 300 400
pressure / atm
Which statement about this equilibrium reaction is correct?
A Decreasing the temperature decreases the value of the equilibrium constant.
B Decreasing the temperature increases the rate of this reaction.
C Increasing the pressure increases the value of the equilibrium constant.
The reaction is exothermic in the forward direction.


LCP (Le Chatelier’s Principle), Factors Affecting Reaction Rates, Kc | 2004 - M/J - 9701/1 | Q11