In the reaction 2NOCl (g) <-----> 2NO (g) + Cl2 (g) ,what changes to the equilibrium will serve to decrease the concentration of Cl2 ?


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Acording to LeChatelier's principle, equilibrium shifts to releive any stresss placed on it .If NO is added,the equilibrium will shift to the left, and the concentration of  the Cl2 will decrease , so if we need to decrease the concentration of a product the equilibrium should shift towards the reactant side that can happen if we either add more of the another product or if we remove any reactant .


We could decrease the concentration of Cl2 by shifting the equilibirum towards the left and this we can do by adding more NO or removing the NOCl