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Does the number of moles of reaction products increase, decrease or remain same when each of the following equilibria is subjected to a decrease in pressure by increasing the volume? (a) PCl _ 5 (g) PCl_ 3 (g)+ Cl_ 2 (g)

7.25     Does the number of moles of reaction products increase, decrease or remain same when each of the following equilibria is subjected to a decrease in pressure by increasing the volume?

 (a)        PCl_{5}_{(g)}\rightleftharpoons PCl_{3}_{(g)}+Cl_{2}_{(g)}

(b)     CaO(s)+CO_{2}(s)\rightleftharpoons CaCO_{3}(s)

(c)     3Fe(s)+4H_{2}O(g)\rightleftharpoons Fe_{3}O_{4}(s)+H_{2}(g)

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According to Le Chatellier's principle, if the pressure is decreased, then the equilibrium will shift in the direction in which more number of moles of gases is present.

So, 

  • (a)The number of moles of reaction products will increase.
  • (b)The number of moles of reaction products will decrease
  • (c)The number of moles of reaction products remains the same.
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