In the preparation of oxygen by heating KCIO₃ , in the presence of MnO₂ only moderate heat is needed because the catalyst acts by ₂

Correct Answer is : increasing the rate of the reaction

lowering the pressure of the reaction

increasing the surface area of the reaction

increasing the energy barrier of the reaction

Correct Answer is : increasing the rate of the reaction

Test Index

JAMB Chemistry 2018 Paper

Question : 22

Total: 87

_3

_2

_2

Solution:

Concept:

A catalyst speeds up a chemical reaction without being used up, allowing the reaction to occur at a lower temperature.

Explanation:

In the preparation of oxygen,

\mathrm{KClO}_3

decomposes when heated, but it needs a high temperature to decompose quickly.

\mathrm{MnO}_2

is added as a catalyst.

The catalyst increases the rate of the reaction by providing an alternative pathway with lower activation energy.

Therefore, only moderate heat is needed because the catalyst increases the rate of the decomposition reaction.

Answer:

C. increasing the rate of the reaction

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