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Chemical Kinetics
Catalysis and Activation Energy
1 question from 1 paper, each with its answer.
- question
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- paper
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- of Chemical Kinetics
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Concepts tested
- Enzymes lower activation energy
All Questions
2001 AIPMT 1 question
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When a biochemical reaction is carried out in laboratory outside the human body in the absence of enzyme, then the rate of reaction obtained is $10^{-6}$ times, then activation energy of reaction in the presence of enzyme is : -An enzyme is a biological catalyst. It provides an alternative reaction path with a lower activation energy.
Without the enzyme (in the laboratory), the rate is only $10^{-6}$ times the rate with the enzyme, which shows that the activation energy without the enzyme is much higher.
From the Arrhenius equation, $\dfrac{k_{enzyme}}{k_{lab}} = e^{(E_{a,lab} - E_{a,enzyme})/RT} = 10^6$, so $E_{a,lab} - E_{a,enzyme} = 2.303 \times 6RT$.
So the activation energy in the presence of the enzyme is different from (lower than) the $E_a$ obtained in the laboratory.