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Q.

A catalytic poison renders the catalyst ineffective because :

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a

It adsorbs the molecules of the products

b

It combines with one of the reactants

c

It is preferentially adsorbed on the catalyst

d

It adsorbs the molecules of the reactants

answer is A.

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Detailed Solution

  • Substance which decreases the activity of catalyst is called catalytic poison.
  • The poison is adsorbed in the surface of the catalyst and hence the catalyst cannot contribute to the reaction and even poisoning can react chemically with the catalyst.
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