In the following question, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices:
Assertion: A positive catalyst increases the rate of reaction.
Reason : In presence of a catalyst, the activation energy of the reaction decreases.
Answer & explanation
Correct answer: option 1
The correct answer is option 1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
The correct answer is: Both assertion and reason are true and the reason is the correct explanation of the assertion.
Assertion: A positive catalyst increases the rate of reaction. This statement is true. A catalyst is a substance that speeds up a chemical reaction without being consumed itself. By lowering the activation energy, a catalyst allows more reactant molecules to reach the activated state needed for the reaction to occur, thus increasing the reaction rate.
Reason: In presence of a catalyst, the activation energy of the reaction decreases. This statement is also true. Activation energy is the minimum energy required for reactant molecules to collide effectively and form products. A catalyst provides an alternative reaction pathway with a lower activation energy, making it easier for the reaction to proceed.
The reason directly explains how a catalyst increases the reaction rate. By lowering the activation energy barrier, the catalyst allows more reactant molecules to overcome this energy barrier and participate in the reaction, leading to a faster overall rate.