d and f BLOCK ELEMENTS MCQ Quiz: GKFix - Bridge of Knowledge

Question 516

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Why do actinoids generally show a wider range of oxidation states compared to lanthanoids?

They have more electrons
They are more electronegative
The 5f orbitals are less buried and more accessible for bonding than the 4f orbitals
They have a larger atomic radius

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What is the primary oxidation state exhibited by actinoids?

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What is the main reason for the relatively high melting points of lanthanoid metals?

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What is the typical coordination number for Ln³⁺ ions in their complexes?

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Why do lanthanoid ions generally not form stable complexes with common ligands like H₂O or NH₃ compared to transition metal ions?

They do not form any complexes
They have a full outer shell
The 4f orbitals are contracted and buried, leading to less effective orbital overlap with ligands
They prefer to exist as free ions