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NEET UG CHEMISTRY MCQ: d & f- BLOCK ELEMENTS
1
Hard
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Understanding
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Pick out the correct statements from the following.
I. Cobalt (III) is more stable in octahedral complexes.
II. Zinc forms coloured ions or complexes.
III. Most of the -block elements and their compounds are ferromagnetic.
IV. Osmium shows (VIII) oxidation state.
V. Cobalt (II) is more stable in octahedral complexes.
I. Cobalt (III) is more stable in octahedral complexes.
II. Zinc forms coloured ions or complexes.
III. Most of the -block elements and their compounds are ferromagnetic.
IV. Osmium shows (VIII) oxidation state.
V. Cobalt (II) is more stable in octahedral complexes.
View answer and explanation
Correct option: D
1 and 4
Cobalt (III) is more stable in octahedral complexes due to crystal field stabilization energy, and Osmium shows (VIII) oxidation state, making statements I and IV correct.
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