Discussion
In case of heterogeneous catalysis which of the following is correct ?
Answer: B
The correct statement is that at least one reactant must be chemisorbed on the catalyst.
A heterogeneous catalyst works by forming chemical bonds with an adsorbed reactant, which weakens its bonds and lowers the activation energy. Physisorption, held by weak van der Waals forces, does not change the molecule enough to activate it, so it is not required; chemisorption of at least one reactant is.
The number of active sites increases, not decreases, with surface area, which is why catalysts are finely divided or dispersed on supports. Surface area is measured by gas adsorption, as in the BET method with nitrogen, not by spectroscopy.
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