Case study·Standard multi-step (3/5)·No calculator
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
A materials lab chooses for an oxidation process, nickel for hydrogenation, and a lanthanoid-containing alloy for lighter flints. The teacher asks students to justify why d- and f-block elements appear in useful materials.
Total: 3 marks
(a) Which example illustrates catalytic use of a transition-metal compound? (1 mark)
(b) Which example illustrates surface catalysis by a metal? (1 mark)
(c) Give one general reason d- and f-block elements have many applications. (1 mark)
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