Question detail

How does the ability to form variable oxidation states enhance the catalytic properties of transition metals?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Transition metals (A-level only)

Question

A. It enables them to participate in a wider range of reactions.
B. It allows them to absorb more heat.
C. It makes them more stable.
D. It increases their density.

Answer

It enables them to participate in a wider range of reactions.

Explanation

The correct option is It enables them to participate in a wider range of reactions.. It enables them to participate in a wider range of reactions. is the best answer because it directly supports the AQA A-Level Chemistry objective to explain catalytic activity of transition metals and their compounds. This reasoning is anchored to Transition-metal characteristics (A-level only) in Transition metals (A-level only), and it separates transition metal from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.

Common mistake

Misunderstanding Catalytic Activity

Students often confuse the role of transition metals as catalysts with their ability to change oxidation states, thinking that all transition metals can catalyze reactions equally.

To clarify, remember that transition metals act as catalysts due to their ability to provide a surface for reactions and their variable oxidation states. For example, iron (Fe) can catalyze the Haber process by forming different oxidation states that facilitate the reaction between nitrogen and hydrogen. This means that while many transition metals can act as catalysts, their effectiveness can vary based on the specific reaction conditions and the metal's properties.

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