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Chemistry · May / June 2023 · Paper 11 · Question 23

5070Transition elements

Which statement about transition elements and their compounds is correct?

  1. ACopper(II) oxide catalyses the conversion of sulfuric acid to copper(II) sulfate.
  2. BIron allows hydrogen and nitrogen to react at a lower temperature.
  3. CNickel increases the rate of reaction between hydrogen and saturated hydrocarbons.
  4. DVanadium(V) oxide speeds up the oxidation of sulfur to sulfur dioxide.

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Correct answer: B. Iron allows hydrogen and nitrogen to react at a lower temperature.

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