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Which of the following statements is not correct?

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Catalyst is not involved in the reaction

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

The mechanism of catalytic reactions may vary from reaction to reaction

NO acts as a homogeneous catalyst in the oxidation of SO2 into SO3

answer is A.

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Detailed Solution

Nitric oxide's catalytic reaction on the production of ${SO}_{3}$

Step-1: $2 NO + O_{2} \to 2 {NO}_{2}$

step 2: $2 {NO}_{2} + 2 {SO}_{2} \to 2 NO + 2 {SO}_{3}$

overall : $2 {SO}_{2} (g) + O_{2} (g) \to 2 {SO}_{3} (g)$

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