Which of the following statement is not correct for the catalyst?
(a) It catalysts the forward and backward reactions to the same extent
(b) It alters $Δ G$ of the reaction
(c) It is a substance that does not change the equilibrium constant of the reaction
(d) It provides an alternate mechanism by reducing activation energy between reactants and products

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Solution

Answer: (b) It alters $Δ G$ of the reaction.

Characteristics of catalyst
(a) It catalysts the forward and backward reaction to the same extent as it decreases the energy of activation hence increases the rate of both the reactions.
(b) Since reaction quotient is the relation between the concentration of reactants and products. Hence, the catalyst does not alter Gibbs free energy as it is related to reaction quotient. Thus, Gibbs free energy does not change during the reaction when the catalyst is added to it:
$Δ G = - R T I n Q$
where Q = reaction quotient
(c) It doesn't alter the equilibrium of reaction as equilibrium constant is also concentration dependent term.
(d) It provides an alternate mechanism by reducing activation energy between reactants and products.

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I \to

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Mark the incorrect statements.
(a)Catalyst provides an alternative pathway to reaction mechanism
(b)Catalyst raises the activation energy
(c)Catalyst lowers the activation energy
(d)Catalyst alters enthalpy change of the reaction

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