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d-and f-Block Elements question bank (Chemistry)

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Q1.

Identify the factor responsible for the greater range of oxidation states in actinoids.

(A)
actinoid contraction
(B)
radioactive nature of actinoids
(C)
$5f$, $6d$ and $7s$ levels having comparable energies
(D)
$4f$ and $5d$ levels being close in energies
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Q2.

Which of the following elements has a completely filled $4f$ orbital in its ground state electronic configuration?

(A)
$La$
(B)
$Yb$
(C)
$Eu$
(D)
$Gd$
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