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Equilibrium — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryEquilibrium5 Marks
Question
Dihydrogen gas is obtained from natural gas by partial oxidation with steam as per following endothermic reaction:
$\text{CH}_4\text{ (g) + H}_2\text{O}\rightleftharpoons\text{CO (g) + 3H}_2\text{ (g)}$
  1. Write as expression for $K_p$ for the above reaction.
  2. How will the values of $K_p$ and composition of equilibrium mixture be affected by.
  1. increasing the pressure
  2. increasing the temperature
  3. using a catalyst?
✓

Answer

  1. $\text{K}_\text{p}=\frac{\text{p}_\text{CO}\times\text{p}^3_{\text{H}_2}}{\text{p}_{\text{CH}_4}\times\text{p}_{\text{H}_2\text{O}}}$
  2.  
  1. By Le Chatelier’s principle, on increasing pressure, equilibrium will shift in the backward direction where decreases number of moles.
  2. As the given reaction is endothermic, by Le Chatelier ‘s principle, equilibrium will shift in the forward direction with increasing temperature.
  3. Equilibrium composition will not be disturbed by the presence of catalyst but equilibrium will be attained quickly.

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