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


7.
Which of the following lanthanoids is radioactive?
A.
La
B.
Ce
C.
Pm
D.
Gd
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ANSWER :
C. Pm
8.
Lanthanoid contraction leads to:
A.
Increased reactivity
B.
Increase in atomic radii
C.
Decrease in atomic radii
D.
Decrease in electronegativity
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ANSWER :
C. Decrease in atomic radii
9.
Which of the following shows only +3 oxidation state?
A.
Eu
B.
Ce
C.
La
D.
Lu
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ANSWER :
D. Lu
10.
Which of the following explains the difference in size between lanthanoids and actinoids?
A.
Electron shielding
B.
Greater number of protons
C.
Poor shielding by 4f and 5f orbitals
D.
Higher oxidation states
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ANSWER :
C. Poor shielding by 4f and 5f orbitals
11.
What is the main cause of color in lanthanoid ions?
A.
Presence of unpaired 5d electrons
B.
Presence of unpaired 4f electrons
C.
Charge transfer
D.
d-d transition
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ANSWER :
B. Presence of unpaired 4f electrons
12.
Lanthanoid contraction is responsible for:

NEET - 2015

A.
Increase in ionic radius
B.
Similarity of chemical properties
C.
Increase in metallic radius
D.
Increase in melting points
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ANSWER :
B. Similarity of chemical properties