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Among the ions Sc³+, Ti³+, V³+, Cr³+, Mn³+, Fe³+, Co³+ and Ni²+, how many can form BOTH high-spin and low-spin octahedral complexes?
- 3
- 4
- 5
- 2
Correct answer: 4
Solution
Mn³+ (d4), Fe³+ (d5), Co³+ (d6) and Ni²+ (d8 -> note); the ones with d4-d7 (Mn³+ d4, Fe³+ d5, Co³+ d6, and Cr³+ is d3 no) give both spin states, totalling 4.
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