Question

Give reasons:

${\mathrm{MnO}}_2$ is used for decomposition of potassium chlorate

Answer 1

Catalyst:

• A catalyst is a substance that increases or decreases the rate of reaction but remains unchanged at the end of the reaction.
• For example Potassium chlorate(${\mathrm{KClO}}_3$) decomposes at $230°\mathrm{C}$ instead $400°\mathrm{C}$ if heated in the presence of manganese dioxide (Catalyst).
• A substance that increases the efficiency of a catalyst is known as the promoter.