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Activity of a catalyst determines __________________

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Activity of a catalyst determines __________________

(a) Yield of end-product

(b) Ability to accelerate the reaction

(c) Ageing

(d) The nature of reactants

I have been asked this question in semester exam.

My question is from Cracking in division Fuels and Combustion of Engineering Chemistry II

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The correct choice is (a) Yield of end-product

For explanation I would say: Activity is a characteristic of alumina-silicate catalyst which determines the yield of the end-product, relative to the starting material used. Selectivity is the measure of the ability of the catalyst to accelerate the desired reaction.

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