How does the rate if a reaction depend upon the catalyst? Give su… - Vidyadip

Question

How does the rate if a reaction depend upon the catalyst? Give suitable example.

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Answer

(1) The substance in whose presence the rate of a chemical reaction changes, without causing any chemical change to it is called a catalyst.
(2) On heating potassium chlorate $\left( KClO _3\right)$ decomposes into potassium chloride and oxygen slowly.
$
2 KClO _3 \stackrel{\Delta}{\longrightarrow} 2 KCl +3 O _2
$
The rate of the above reaction neither increases by reducing the particle size nor by increasing the reaction temperature. However in the presence of manganese dioxide, $KClO _3$ decomposes at a comparatively lower temperature and oxygen is produced more briskly. No chemical change takes place in $MnO _2$ in this reaction. It acts as catalyst.

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