Impirtant features if a solid catalyst is
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Important Features of Solid Catalysts
Activity
Activity of a catalyst refers to the capacity of the catalyst to increase the speed of the chemical reaction. The activity depends upon the extent of chemisorption.
The adsorption should be reasonably strong but not so strong that the adsorbed molecules become immobile and there is no place for other reactants to get adsorbed. Example- Combination of H2 and O2 in the presence of Platinum(catalyst) to form water is an explosive reaction.
But in the absence of catalyst, H2and O2 do not react and can be stored like that for a very long period of time.
2H2(g) + O2(g) --> 2H2O(l)
Selectivity
Selectivity of a catalyst refers to its ability to direct the reaction to form particular products excluding others.
Example- CO and H2 form different products in the presence of different catalysts

Note- Catalysts are very specific and selective in their action. So a substance which acts as a catalyst in one reaction may fail to catalyse another reaction
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Activity
Activity of a catalyst refers to the capacity of the catalyst to increase the speed of the chemical reaction. The activity depends upon the extent of chemisorption.
The adsorption should be reasonably strong but not so strong that the adsorbed molecules become immobile and there is no place for other reactants to get adsorbed. Example- Combination of H2 and O2 in the presence of Platinum(catalyst) to form water is an explosive reaction.
But in the absence of catalyst, H2and O2 do not react and can be stored like that for a very long period of time.
2H2(g) + O2(g) --> 2H2O(l)
Selectivity
Selectivity of a catalyst refers to its ability to direct the reaction to form particular products excluding others.
Example- CO and H2 form different products in the presence of different catalysts

Note- Catalysts are very specific and selective in their action. So a substance which acts as a catalyst in one reaction may fail to catalyse another reaction
HOPE U GET UR ANSWER..
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