Inner Transition Element : Lanthanoids(Electronic Configuration, Oxidation States, and Lanthanoid Contraction) NEET Questions

Inorganic Chemistry - D- and F-Block Elements

Inner Transition Element : Lanthanoids(Electronic Configuration, Oxidation States, and Lanthanoid Contraction) MCQ Questions


13.
Which of the following is true for lanthanoid contraction?
A.
No change in size
B.
Increase in ionic radius
C.
Gradual decrease in ionic radius
D.
Fluctuating ionic size
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ANSWER :
C. Gradual decrease in ionic radius
14.
In lanthanoids, 4f orbitals are:
A.
Shielded by outer 5d
B.
Exposed to outer environment
C.
Well shielded from nuclear charge
D.
Poorly shielded from nuclear charge
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ANSWER :
D. Poorly shielded from nuclear charge
15.
Which of the following is least paramagnetic?
A.
Nd³⁺
B.
Sm³⁺
C.
Eu³⁺
D.
Lu³⁺
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ANSWER :
D. Lu³⁺
16.
Ce⁴⁺ is a strong oxidizing agent because:
A.
Has high ionization energy
B.
Can gain electron to become stable Ce³⁺
C.
Its d-orbitals are half-filled
D.
Forms strong complexes
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ANSWER :
B. Can gain electron to become stable Ce³⁺
17.
Lanthanoids show variable oxidation states due to:
A.
Instability of 4f electrons
B.
Shielding of 6s electrons
C.
Low energy difference between 4f and 5d subshells
D.
Presence of unpaired electrons
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ANSWER :
C. Low energy difference between 4f and 5d subshells
18.
Which of the following is most stable in +2 oxidation state?
A.
Eu²⁺
B.
Nd²⁺
C.
Sm²⁺
D.
Dy²⁺
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ANSWER :
A. Eu²⁺