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

Question 696

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Which of the following best summarizes the electronic configuration of the most stable ion formed by Lanthanum (La)?

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What is the significance of the statement that the shielding of one 4f electron by another is 'less' than one d electron by another?

It explains why the lanthanoid contraction is more pronounced than typical d-block contractions
It means 4f electrons are completely unshielded
It indicates 4f electrons shield better than s electrons
It shows d electrons provide no shielding

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How does the text reconcile the fact that Ce⁴⁺ is a strong oxidant with its use as a good analytical reagent?

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Which of the following Lanthanoids is explicitly mentioned as exhibiting both +2 and +3 oxidation states, similar to Europium?

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What is the main reason given for the occasional formation of +2 and +4 oxidation states in Lanthanoids?

Extra stability from specific f-subshell configurations (empty, half-filled, or filled)
Lower ionization energies for the second and fourth electrons
Higher electronegativity
Greater atomic radii