Chemistry Reaction Kinetics MDCAT 2017
PMDC Verified Question 64 of 80
Which one of the following graphs is representation for more rapid catalyzed reaction?
A
Graph showing a lowered activation energy path (solid line) compared to original higher path (dotted line)
B
Graph showing equilibrium shifted entirely to the right with no activation barrier
C
Graph showing a single high activation energy peak (uncatalyzed pathway)
D
Graph showing multiple consecutive high-energy intermediate peaks without lowering overall energy
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Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Graph showing a lowered activation energy path (solid line) compared to original higher path (dotted line)
Concept:

A catalyzed reaction provides an alternative pathway that requires less activation energy compared to the uncatalyzed reaction.

Solution:

  • In potential energy diagrams, the vertical axis represents energy.
  • The peak of the curve represents the activation energy barrier.
  • A rapid catalyzed reaction is visually represented by a curve with a significantly lower peak (solid line) than the uncatalyzed pathway (dotted line), indicating a lowered activation energy (\( E_a \)).


Why other options are incorrect:

A single high peak represents a slow, uncatalyzed reaction. Multiple high peaks or completely flat barriers do not accurately represent standard positive catalytic lowering of \( E_a \).

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