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Types of Catalysis

Catalytic poi...

Question

Catalytic poisons act by:

A

making the products chemically inactive

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B

increasing the rate of the backward reaction

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C

chemical combination with any one of the reaction

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D

preferential adsorption on the catalyst surface

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Solution

The correct option is D preferential adsorption on the catalyst surface
The catalytic poisons. decreases the activity of catalyst by preferential adsorption on catalyst surface due to strong preferential adsorption of the poison on the surface of the catalyst.

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Q. Which of the following factors are responsible for the increase in the rate of a surface catalysed reaction?
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III. The catalyst increases the activation energy of the reaction
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Q. Read the given paragraph and write answers of the following questions.
When any solid substance is kept in contact with liquid or gas, then liquid or gas are more adsorbed on the surface of solid rather than bulk. The process is known as adsorption. It is different from absorption. Many gaseous reaction occurs in the presence of solid catalyst. Catalyst is a chemical substance which change the rate of reaction without undergoing itself change. This phenomenon is known as catalysis.
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2)Heat of adsorption of reactants on a catalyst helps reactant molecules to overcome activation energy
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4)Adsorption increases the local concentration of reactant molecules on the surface of the catalyst.
Select the correct answer using the code given below :

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