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What will be the effect of a decrease in…

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CHEMISTRY

Consider the reaction:

What will be the effect of a decrease in pressure on the reaction

What will be the effect of a decrease in pressure on the reaction?

  • A. The equilibrium will shift
  • B. Rate of forward reaction will increase
  • C. Rate of backward reaction will increase
  • D. Rates of forward and backward reaction are not affected

QUICK ANSWER…

C

DETAILS…  

Change in pressure on a chemical reaction will only affect a reaction that has at least one of the products or reactants as gas. For the above reaction, two volumes of gas can be found on the left-hand side, while one volume of gas can be found on the right.

Now, increase in pressure will favor the side with more volume, and a decrease will favor the side with less volume.

Hence, a decrease in pressure in the above reaction will favor the backward reaction.

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Now for the right answer to the above question:

  1. Option A is incorrect. yes the equilibrium position will shift, but this option does not specify the direction of shift.
  2. Option B is incorrect. rate of forward reaction will only increase if the pressure is increased, and not decreased.
  3. C is correct. Decrease in pressure favors the side with lesser volume of gas.
  4. D is not the correct answer. As long as the volume of gas on both sides is not equal, the rate of forward and backward reaction must be affected.

KEY-POINTS…

You may please note these/this:

  • Pressure does not affect a reaction where neither the reactant nor the product contains a gas.
  • One of the products or reactants must be gaseous for change in pressure to affect the rate of reaction.

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/culled from 2019 JAMB-UTME Chemistry question 23/

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