Question

A catalyst is a substance that changes the rate of reaction without itself undergoing any chemical change.

• A. True
• B. False

Answer 1

The correct option is A True

• A catalyst is a substance that changes the rate of reaction without itself undergoing any chemical change.
• Example - Potassium chlorate $\left({\mathrm{KClO}}_3\right)$ decomposes into potassium chloride$\left(\mathrm{KCl}\right)$ and oxygen$\left({\mathrm{O}}_2\right)$ in the presence of catalyst manganese dioxide$\left({\mathrm{MnO}}_2\right)$.

$2{\mathrm{KClO}}_3\left(\mathrm{s}\right)\stackrel{{\mathrm{MnO}}_2}{\to }2\mathrm{KCl}\left(\mathrm{s}\right)+3{\mathrm{O}}_2\left(\mathrm{g}\right)$

Thus, the given statement is true.