Question 45

The correct reaction profile diagram for a positive catalyst reaction.

Solution

A positive catalyst increases the rate of a chemical reaction by providing an alternative reaction pathway with a lower activation energy ($$E_a$$).

Without Catalyst: Higher energy barrier (higher peak).
With Catalyst: Lower energy barrier (lower peak).
The potential energy of the reactants and products remains completely unaffected by the catalyst.

For identifying the True Correct Diagram:

Both curves must start at the exact same Reactant energy level line.
Both curves must finish at the exact same Product energy level line.
The solid/dashed curve labeled "with catalyst" must have its peak maximum pointing lower down on the vertical Energy axis than the "without catalyst" peak.

Hence, Option B is correct

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