Chemistry Reaction Kinetics UHS 2022
PMDC Verified Question 28 of 80
The catalysis in which the catalyst and the reactants are in the same phase is known:
A
Heterogeneous catalysis
B
Homogeneous catalysis
C
Slow
D
Fast
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Homogeneous catalysis
Concept:

Catalytic systems are classified based on the physical state (solid, liquid, gas) of the catalyst compared to the physical state of the reacting mixture.

Solution:

  • The prefix "homo-" means "same".
  • When the catalyst dissolves completely into the reactant mixture (e.g., both are liquids, or both are gases) so that only a single phase exists, it is termed homogeneous catalysis.


Why other options are incorrect:

Heterogeneous catalysis (hetero = different) occurs when the catalyst is in a different phase (e.g., solid metal in a gas mixture). Slow/fast describe reaction speeds, not the classification of the catalytic phase.

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