Answer :

The type of catalysts are as follows –


iii. Based on their physical state:


a. Heterogeneous catalyst :


When in a reaction the catalysts, reactants, and products are in different physical states then the catalyst is known as heterogeneous catalyst.


Example-


Vegetable oil (l) + H2 (g) Vegetable ghee (l)


b. Homogeneous catalyst:


When in a reaction the catalysts, reactants and products are in the same phase then the catalyst is known as homogeneous catalyst.


Example:-


2SO2 (g) + O2 (g) 2SO3 (g)


iv. Based on their action:


a. Positive catalyst:


The catalysts which increases the rate of a reaction are termed as positive catalyst.


Example:


2KClO3 2KCl + 3O2


b. Negative catalyst:


The catalysts which decreases the rate of a reaction are termed as negative catalyst.


Example:


2H2O2 2H2O + O2


c. Auto-catalyst;


When the product formed in a reaction itself behaves as a catalyst, then it is known as auto-catalyst.


Example:


CH3COOC2H5 + H2O CH3COOH + C2H50H


d. Bio-catalyst:


The catalyst which increases the rate of the biochemical reactions occurring in a living organism are termed as bio-catalyst. These are also known as enzymes.


Example:


Maltose Glucose


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