During rate of reverse step...
A. A catalyst decreases the reverse rate of reaction.
B. A catalyst does not change the reverse rate of reaction.
C. A catalyst increases the reverse rate of reaction.
A catalyst hastens the time for equilibrium to be attained.
A
A
To determine the effect of a catalyst on the rate of the reverse step of a reaction, we need to understand how catalysts work.
A catalyst is a substance that speeds up the rate of a chemical reaction by providing an alternative reaction pathway with a lower activation energy. It does this by providing a surface where reactant molecules can come together and react more easily.
In the context of the reverse step of a reaction, a catalyst can influence the rate in several ways. However, it is important to note that a catalyst does not change the equilibrium constant or shift the position of the equilibrium.
Option A states that a catalyst decreases the reverse rate of reaction. This is incorrect. A catalyst actually enhances the rate of both the forward and reverse reactions equally. As a result, the catalyst does not change the reverse rate of the reaction.
Option B states that a catalyst does not change the reverse rate of reaction. This is the correct answer. Since a catalyst speeds up both the forward and reverse reactions equally, it does not alter the rate at which the reverse step occurs specifically.
Option C states that a catalyst increases the reverse rate of reaction. This is also incorrect. As mentioned, a catalyst accelerates the overall reaction rate but does not specifically target the reverse step.
Therefore, the correct answer is B. A catalyst does not change the reverse rate of reaction.