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Nickel is used in the hydrogenation of alkenes because it

Chemistry
WAEC 2025

Nickel is used in the hydrogenation of alkenes because it

  • A. Increases the yield of the product
  • B. lowers the activation energy of the reaction
  • C. makes the reaction more exothermic
  • D. prevents a reverse reaction from occuring
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Correct Answer: Option B
Explanation

Nickel acts as a catalyst in the hydrogenation of alkenes. Catalysts function by providing an alternative reaction pathway with a lower activation energy. By lowering the energy barrier, a larger fraction of reactant molecules have sufficient energy to react at a given temperature, which significantly increases the reaction rate. In this specific reaction, nickel adsorbs hydrogen onto its surface, weakening the H-H bonds and facilitating their addition to the alkene.


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