Which of the following explains the increase of reaction rate by a catalyst?

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Catalyst provides the necessary energy to the colliding molecules to cross the barrier.

Catalyst decreases the rate of backward reaction so that the rate of forward reaction increases.

Catalyst decreases the enthalpy change of the reaction.

Catalyst provides an alternative path of lower activation energy.

answer is D.

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Detailed Solution

A catalyst is a substance, which increases the rate of reaction without itself being consumed at the end of the reaction, and the phenomenon is called catalysis.
There are some catalysts which decrease the rate of reaction and such catalysts are called negative catalyst.
The catalyst accelerating the rate will be positive catalyst.
Catalyst provides alternate path and speeds the rate of reaction lowers the activation energy

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