The reaction 2SO2(g)+O2(g)⇌2SO3(g) is at equilibrium where will the equilibrium shift after the addition of Pt platinum catalyst ?

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Explanation: 

The given reaction is at equulibrium if we add Pt platinum catalyst or any other catalyst it will absolutely not the equilibrium because the catalsyt just increases the rate of reaction but does not take part in the chemical reaction .So, addition of catalyst will have no effect on equilibrium.

Answer: 

additon of catalyst Pt will have no effect on equilibrium

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