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
Two octahedral complexes are compared. Complex I has a weak-field ligand and complex II has a strong-field ligand. Assume the usual high-spin and low-spin arrangements.
Total: 3 marks
(a) How many unpaired electrons are expected in complex I? (1 mark)
(b) How many unpaired electrons are expected in complex II? (1 mark)
(c) Which complex should have the larger spin-only magnetic moment? (1 mark)
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