Question

The element Co exists in two oxidation states, Co(II) and Co(III), and the ions form many complexes. The rate at which one of the complexes of Co(III) was reduced by Fe(II) in water was measured. What is the oxidation state of Co in the complex?

1) Co(II)
2) Co(III)
3) Co(IV)
4) Co(V)

Answer 1

The oxidation state of Co in the complex being reduced by Fe(II) is Co(III). Without specific experimental data or reaction rates, it is not possible to calculate the activation energy of the reaction.

Step-by-step explanation:

The oxidation state of Co in the complex where it is being reduced by Fe(II) is Co(III). Reduction involves a decrease in oxidation state. Since the complex of Co(III) is being reduced, it means the starting oxidation state of Co in the reaction is +3. The question does not provide sufficient data to determine the activation energy of the reaction. Activation energy would typically be calculated using experimental data and applying a formula such as the Arrhenius equation, which relates the rate constant to temperature and activation energy. Since no specific data points or reaction rates at varying temperatures are provided, the activation energy cannot be calculated from the information given.