Enzymes increase the rate of reactions by

Increasing the free energy of activation.

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Decreasing the energy of activation.

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Changing the equilibrium constant of the reaction.

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Increasing the free energy change of the reaction.

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Solution

The correct option is B Decreasing the energy of activation.
Reactions do not undergo chemical change automatically, they do so in transition state. Transition state has more free energy than reactants or products. Higher free energy helps in collision of transition state reactants. The inability of reactants to undergo change due to requirement of extra energy for converting them into transition state is called as an energy barrier. Energy required to overcome energy barrier is called as an activation energy. Enzymes reduce requirement of activation energy and thus increase rate of reaction.
So, the correct answer is 'Decreasing the energy of activation.'

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Similar questions

Which of the following statements are in accordance with the Arrhenius equation?
(a) Rate of a reaction increases with increase in temperature
(b) Rate of a reaction increases with a decrease in activation energy
(c) Rate constant decreases exponentially with an increase in temperature
(d) Rate of reaction decreases with a decrease in activation energy

Q. Assertion :Enzymes are required in very less amount in reactions. Reason: Enzymes increases the activation energy of reactions.

Q. For a substitution reaction, rate constant increases by factor

10.6

when temperature changes from

25^{o} C

35^{o} C

. Calculate energy of activation of the reaction.

Consider the Arrhenius equation given below and mark the correct option.
$k = A . e - \frac{E_{a}}{R T}$
(a) Rate constant increases exponentially with increasing activation energy and decreasing temperature
(b) Rate constant decreases exponentially with increasing activation energy and decreasing temperature
(c) Rate constant increases exponentially with decreasing activation energy and decreasing temperature
(d) Rate constant increases exponentially with decreasing activation energy and increasing temperature

Q. Assertion :A rate of reaction of most of the reactions doubles, when temperature increased from

298 K

308 K

. Reason: The activation energy of reaction decreases with increase in temperature.

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