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A catalyst :

Question

A catalyst :

Changes

Δ G

for an equation

Acts by increasing the rate of the forward reaction more than the reverse reaction

Raises the equilibrium constant of a system

May have molecular weight as low as 1 or higher than 200,000

Does not react chemically during the course of a reaction

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Characteristics of catalyst are as follows:

1. The catalyst remains unchanged (in mass and chemical composition ) in the reaction (Activity of catalyst)

2. A small quantity of the catalyst is required. e.g. one mole of colloid pt catalyses

1 0^{8} L H_{2} O_{2}

3. The catalyst does not change the equilibrium constant. But the equilibrium approaches earlier.

4. Specificity of catalyst:

The catalyst is specific in nature. It means by the change of catalyst, nature of the product changes or

specific catalyst for a specific reaction.

5. The catalyst can not make impossible reaction to occur and does not initiate a reaction.

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