Question

A catalyst accelerates the reaction because
a) It brings the reactants closer
b) It lowers the activation energy
c) it changes the heat of reaction
d) It increases the activation energy
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Answer 1

Answer:

A catalyst forms a substrate-enzyme complex due to which the activation energy of the reaction is lowered as shown in the figure. This, in turn, increases the rate of the reaction, thus accelerating it.

Hence , option d is correct.

Answer 2

Answer:

(B)- It lowers the activation energy.

Explanation:

A catalyst is a substance that can be added to a reaction to increase the reaction rate without getting consumed in the process.

• The presence of a catalyst increase the reaction rate(in both forward and reverse reactions) by providing an alternative pathway with lower activation energy.
• If the activation energy is lowered, more reactants can cross that barrier easily and so, the rate of reaction increases.

Thus, simply, we can say the role of a catalyst is to lower the activation energy so that a greater proportion of the particles have enough energy to react.

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