Question

A catalytic poison renders the catalyst ineffective because:

• A. It is preferentially occupy surface of the catalyst.
• B. It adsorbs the molecules of the reactants.
• C. It combines chemically with the catalyst.
• D. It combines with one of the reactants.

Answer 1

The correct option is A It is preferentially occupy surface of the catalyst.

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.
Hence option A is correct.