What is a catalyst? What is an inhibitor?

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(N/A) Catalyst: $A$ catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change. For example,$MnO_{2}$ acts as a catalyst in the following reaction to increase its rate significantly:
$2KClO_{3} \xrightarrow{MnO_{2}} 2KCl + 3O_{2}$
Inhibitor: When an added substance reduces the rate of a chemical reaction,it is called an inhibitor. The term catalyst should not be used to describe an inhibitor.

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What is the role of desorption in the process of catalysis?

$H_2C=CH_2 + O_2 \xrightarrow{\text{aqueous medium}} CH_3CHO$. What is the catalyst used in the above green reaction?

Match the following:
$List-I$ (Process) $List-II$ (Catalyst)
$(A)$ Ostwald's process $(I)$ $NO$
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The correct answer is:

Which of the following is true about a catalyst?

In the case of autocatalysis,..........

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