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SAT II Chemistry Exam Prep

Category - Multiple Choice

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Consider the following system at equilibrium:

2NOCl(g) <--> 2NO(g) + Cl2(g)

According to Le Chatelier’s principle, what will occur when the equilibrium concentration of NOCl(g) is reduced?
  1. The equilibrium concentration of NO(g) alone decreases
  2. The equilibrium concentration of Cl2(g) alone decreases
  3. The equilibrium concentrations of both NO(g) and Cl2(g) decrease
  4. The equilibrium concentration of NO(g) alone increases.
  5. There will be no effect on the concentrations of NO(g) and Cl2(g)
Explanation
Answer: The equilibrium concentrations of both NO(g) and Cl2(g) decrease


According to Le Chatelier’s Principle, stress on an equilibrium will shift the equilibrium in the direction that reduces the stress. When the equilibrium concentration of NOCl(g) is reduced, the equilibrium shifts to the left. Thus, the equilibrium concentrations of both NO(g) and Cl2(g) decrease.
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