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JAMB Chemistry 1999 Question 26

Question 26

Chemical Equilibrium

N2O4(g) ⇌ 2NO2(g). Increase in total pressure of the equilibrium reaction above will

  1. A.produce more of NO2(g) in the mixture
  2. B.convert all of N2O4(g) to NO2(g)
  3. C.have no effect on the concentrations of NO2(g) and N2O4(g)
  4. D.produce more of N2O4(g) in the mixture.
Show the answer and explanation

Answer: D (produce more of N2O4(g) in the mixture.)

Explanation

Raising the pressure favours the side with fewer gas molecules. The left side has 1 molecule against 2 on the right, so more N2O4 forms.