Question

During a chemical reaction, the

(a) mass of catalyst remains unchanged

(b) physical state of catalysts remain unchanged

(c) changes in chemical composition of catalysts may be observed

(d) chemical composition of catalyst may change

I have been asked this question in unit test.

My question is from Concentration Gradients and Reaction Rates in Solid Catalysts topic in section Heterogenous Reactions of Bioprocess Engineering

Answer 1

The correct choice is (a) mass of catalyst remains unchanged

Explanation: Catalyst is defined as a substance, which alters the rate of a chemical reaction, itself remaining chemically unchanged at the end of the reaction. The process is called Catalysis.