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1. State the Le-Chatelier’s principle. 

2. Apply the above principle in the following equilibrium and predict the effect of pressure.

CO(g) + 3H2(g) ⇌ CH4(g) + H2O(g)

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1. The Le Chateliers principle states that a change in any of the factors that determine the equilibrium conditions of a system will cause the system to change in such a manner so as to reduce or to counteract the effect of the change. 

2. On increasing pressure the rate of forward reaction increases. This is because number of moles decreases in the forward reaction. In other words, the value of Qc decreases on increasing pressure. As Qc < Kc , the reaction proceeds in the forward direction.

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