2. Consider this gas phase equilibrium system: PC15(g) ? PC13(g) + Cl2(g) AH\'m

Question

2. Consider this gas phase equilibrium system: PC15(g) ? PC13(g) + Cl2(g) AH'm = +87.8 kJ/mol. Which of these statements is false? A) Increasing the system volume shifts the equilibrium to the right. B) Increasing the temperature shifts the equilibrium to the right. C) A catalyst speeds up the approach to equilibrium and shifts the position of equilibrium to the right. D) Decreasing the total pressure of the system shifts the equilibrium to the right. E) Increasing the temperature causes the equilibrium constant to increase

Explanation / Answer

Here the false statement is

C) A catalyst speefssup the approach to equilibrium and shift the position of equilibrium to the right.

Catalyst speed up the both forward and backword reaction with same rate. Adding catalyst will have no net effect on the final equilibrium position.

According to Lechatliers principle,

Increasing volume or decreasing pressure will shift the equilibrium towards more number of gaseous molecules side.

So A and D are correct.

For endo thermic reaction increasing temperature will shift the equilibrium towards products side.

So B is correct

For endo thermic reaction increasing temperature will increase the equilibrium constant.

So E is correct.

Hence false statement is (C)

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