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Factors Affecting the Rate of a Chemical Reaction

A catalyst in...

Question

A catalyst increases the rate of reaction by_________.

A

Decreasing enthalpy

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B

Decreasing internal energy

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C

Decreasing activation energy

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D

Increasing activation energy

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Solution

The correct option is C Decreasing activation energy
A catalyst increases the rate of reaction by decreasing activation energy.
Note: The function of enzymes in the living system is to catalyse biochemical reaction.
Enzymes are highly substrate specific and catalyze reactions by providing an alternate pathway of lower activation energy.

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Q. Assertion :A positive catalyst increases the rate of a reaction. Reason: In presence of a catalyst, the activation energy of the reaction increases.

Q. Statement 1: Catalysts decrease the rate of a chemical reaction.
Statement 2: Catalysts decrease the activation energy.

Assertion: A catalyst increases the rate of the reaction.

Reason: Catalysts lowers the activation energy of the reactants.

Q. Assertion :The activation energy for an uncatalysed reaction is less than for a catalysed reaction Reason: Negative catalyst increases the activation energy

Q. Assertion : A catalyst that increases the rate of a forward reaction also increases the rate of the reverse reaction
Reason : The activation energy for a forward reaction is necessarily equal to the of the reverse reaction.

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