Question

Which of the following statements is not correct?

(a) Catalyst is not involved in the reaction

(b) The concentration of a catalyst remains constant throughout the progress of chemical reaction

(c) The mechanism of catalytic reactions may vary from reaction to reaction

(d) NO acts as a homogenous catalyst in the oxidation of SO2 to SO3

This question was posed to me during an interview for a job.

The query is from Surface Chemistry topic in portion Surface Chemistry of Chemistry – Class 12

Answer 1

The correct answer is (a) Catalyst is not involved in the reaction

The explanation: Catalyst is a substance which increases or decreases the rate of reaction but itself does not undergo any chemical change during the reaction. Catalysts that increase the rate are called positive catalysts and the catalysts that decrease the rate are called negative catalysts.