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Which of the Following Reactions Will Get Affected by Increasing the Pressure? Also, Mention Whether Change Will Cause the Reaction to Go into Forward Or Backward Direction. - Chemistry

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Answer in Brief

Which of the following reactions will get affected by increasing the pressure? Also, mention whether change will cause the reaction to go into forward or backward direction.

  1. \[\ce{COCl2 (g) ⇌ CO (g) + Cl2 (g)}\]
  2. \[\ce{CH4 (g) + 2S2 (g) ⇌ CS2 (g) + 2H2S (g)}\]
  3. \[\ce{CO2 (g) + C (s) ⇌ 2CO (g)}\]
  4. \[\ce{2H2 (g) + CO (g) ⇌ CH3OH (g)}\]
  5. \[\ce{CaCO3 (s) ⇌ CaO (s) + CO2 (g)}\]
  6. \[\ce{4 NH3 (g) + 5O2 (g) ⇌ 4NO (g) + 6H2O(g)}\]
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Solution 1

The reactions given in (i), (iii), (iv), (v), and (vi) will get affected by increasing the pressure.

The reaction given in (iv) will proceed in the forward direction because the number of moles of gaseous reactants is more than that of gaseous products.

The reactions given in (i), (iii), (v), and (vi) will shift in the backward direction because the number of moles of gaseous reactants is less than that of gaseous products.

Solution 2

Only those reactions will be affected by increasing the pressure in which the number of moles of the gaseous reactants and products is different (np ≠ nr) (gaseous). With the exception of reaction (1); all the remaining five reactions will get affected by increasing the pressure. In general

  • The reaction will go to the left if np> nr.
  • The reaction will go to the right if nr > np .
    Keeping this in mind,
  1. Increase in pressure will not affect equilibrium because np = nr = 3.
  2. Increase in pressure will favour backward reaction because np (2) > nr (1)
  3. Increase in pressure will favour backward reaction because np (10) > nr (9)
  4. Increase in pressure will favour forward reaction because np (1) < nr (2)
  5. Increase in pressure will favour backward reaction because np (2) > nr(1)
  6. Increase in pressure will favour backward reaction because np (1) > nr (0).
Concept: Le Chatelier’S Principle and Its Applications to Chemical Equilibria - Effect of Catalyst
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APPEARS IN

NCERT Chemistry Part 1 and 2 Class 11
Chapter 7 Equilibrium
EXERCISES | Q 7.26 | Page 235
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