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In the preparation of oxygen by heating KClO\(_3\) in the presence of MnO\(_2\), only moderate...

Chemistry
JAMB 2010

In the preparation of oxygen by heating KClO\(_3\) in the presence of MnO\(_2\), only moderate heat is needed because the catalyst acts by?

  • A. lowering the pressure of the reaction
  • B. increasing the surface area of the reactant
  • C. increase the rate of the reaction
  • D. lowering the energy barrier of the reaction
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Correct Answer: Option D
Explanation

In the thermal decomposition of potassium chlorate ((KClO\(_3\) ), manganese(IV) oxide (MnO\(_2\)) acts as a catalyst. A catalyst functions by providing an alternative reaction pathway with a lower activation energy (the "energy barrier"). Because this barrier is lowered, more reactant particles possess sufficient kinetic energy to undergo successful collisions at a lower temperature, allowing the reaction to proceed efficiently with only moderate heat. 

While option C is also a characteristic of catalysts, option D specifically explains how the catalyst enables the use of moderate heat rather than the high temperatures required for the uncatalyzed reaction

There is an explanation video available below.


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Explanation Video

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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Post UTME Past Questions Agent
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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