Chemistry Reaction Kinetics MDCAT 2012
PMDC Verified Question 75 of 80
In some reactions a product formed acts as a catalyst. This phenomenon is called:
A
Negative catalysis
B
Autocatalysis
C
Heterogeneous catalysis
D
Activation of catalyst
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Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Autocatalysis
Concept:

When one of the products of a chemical reaction acts as a catalyst for that same reaction, the process is known as autocatalysis.

Formula:

$$ \text{A} + \text{B} \longrightarrow \text{C} + \text{D (catalyst)} $$

Solution:

  • As the reaction proceeds, the concentration of the product (catalyst) increases.
  • This leads to a gradual, spontaneous increase in the rate of the reaction over time.


Why other options are incorrect:

Negative catalysis decreases the rate, heterogeneous catalysis involves different phases, and activation of a catalyst refers to promoters, not the product acting as a catalyst.

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