NEET 2016 Phase 1 · ChemistryArrheniusPrevious Year Question
The addition of a catalyst during a chemical reaction alters which of the following quantities?
Answer: (D) Activation energy. \textbf{Answer:} (D) Activation energy \textbf{Solution:} A catalyst provides an alternative reaction pathway with a lower activation energy by stabilising the transition state (activated complex).
- A.Entropy
- B.Internal energy
- C.Enthalpy
- D.Activation energy✓
Correct Answer
(D) Activation energy
Solution & Explanation
\textbf{Answer:} (D) Activation energy \textbf{Solution:} A catalyst provides an alternative reaction pathway with a lower activation energy by stabilising the transition state (activated complex). It does not change the thermodynamic state functions of the reaction (entropy, internal energy, enthalpy), since these depend only on the initial and final states, which the catalyst leaves unchanged. Hence the catalyst alters only the activation energy.
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