When a catalyst is added to a reaction mixture,

it has no effect on the equilibrium composition of the reaction.
it provides a lower activation energy for the reaction.
it speeds up both forward and reverse reactions.
it speeds up a reaction by providing an alternate pathway for the reaction
the rate law remains the same.

Which of these is/are true?

Question

When a catalyst is added to a reaction mixture,

it has no effect on the equilibrium composition of the reaction.
it provides a lower activation energy for the reaction.
it speeds up both forward and reverse reactions.
it speeds up a reaction by providing an alternate pathway for the reaction
the rate law remains the same.

Which of these is/are true?

BlackTom AI · Accepted Answer

Consider the role of a catalyst in a chemical reaction. 
Option 1: It has no effect on the equilibrium composition of the reaction. True. A catalyst speeds up the attainment of equilibrium but does not shift the position of equilibrium itself; it lowers the energy barrier for both forward and reverse processes equally. 
Option 2: It provides a lower activation energy for the reaction. True. The essence of a catalyst is to offer an alternative pathway with a smaller activation energy, making the reaction proceed more rapidly. 
Option 3: It speeds up both forward and reverse reactions. True. By providing a lower-energy pathway for the reaction steps, both directions are accelerated, maintaining the same equilibrium constant. 
Option 4: It speeds up a reaction by providing an alternate pathway for the reaction. True. This is the fundamental mechanism by which catalysts work: an alternate mechanism with a lower energy barrier than the uncatalyzed route.

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