In heterogenous catalysis of a gaseous reactants over solid catalysta)Reaction occurs on the surface of catalystb)Reaction occurs when gases diffuse towards the surface of catalystc)Reaction starts when gases are about to desorb from the catalyst surfaced)Reaction occurs before adsorption of reactantsCorrect answer is option 'A'. Can you explain this answer?

Question

Answer

In heterogeneous catalysis reaction occurs when gases diffuse towards the surface of catalyst

Answer

The correct answer is Option A.
The reactant gases adsorb on the surface of the catalyst and reaction occurs on the surface itself.

Answer

Explanation:

In heterogeneous catalysis, the reaction occurs on the surface of the catalyst. This means that the reactant molecules need to come into contact with the catalyst surface in order for the reaction to take place.

Reaction Occurs on the Surface of Catalyst:
When a gaseous reactant comes into contact with the solid catalyst, it adsorbs onto the surface of the catalyst. This adsorption process involves weak intermolecular forces between the reactant molecules and the catalyst surface. Once the reactant molecule is adsorbed onto the surface, it can react with other adsorbed molecules or with other reactant molecules that are nearby. These reactions result in the formation of products, which can then desorb from the catalyst surface.

Reaction Occurs when Gases Diffuse towards the Surface of Catalyst:
While it is true that the gases need to diffuse towards the surface of the catalyst in order to come into contact with it, this is not the defining step of the reaction. Diffusion is simply the process by which the gas molecules move from areas of high concentration to areas of low concentration. Once the gas molecules reach the catalyst surface, they can adsorb and react.

Reaction Starts when Gases are about to Desorb from the Catalyst Surface:
Similarly, while it is true that the products of the reaction can desorb from the catalyst surface, this is not the defining step of the reaction. Desorption is simply the process by which the adsorbed molecules on the catalyst surface are released back into the gas phase. The reaction itself occurs when the reactant molecules adsorb onto the catalyst surface and react with other adsorbed molecules or nearby reactant molecules.

Reaction Occurs before Adsorption of Reactants:
This statement is incorrect. The reaction cannot occur before the adsorption of reactants because the reactant molecules need to come into contact with the catalyst surface in order to react. Adsorption is the first step in the reaction process, as it brings the reactant molecules into the proximity of each other and the catalyst surface, facilitating the reaction.

In summary, in heterogeneous catalysis of gaseous reactants over a solid catalyst, the reaction occurs on the surface of the catalyst through the adsorption of reactant molecules, followed by their reaction with other adsorbed molecules or nearby reactant molecules.

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