Transition Elements (General Introduction, Electronic Configuration,...) NEET Questions

Inorganic Chemistry - D- and F-Block Elements

Transition Elements (General Introduction, Electronic Configuration,...) MCQ Questions


7.
The number of d-electrons in Fe²⁺ (Z=26) ion is:
A.
4
B.
7
C.
6
D.
5
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ANSWER :
C. 6
8.
Which one of the following ions has electronic configuration [Ar]3d⁶?
A.
Fe²⁺
B.
Mn²⁺
C.
Co³⁺
D.
Ni³⁺
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ANSWER :
A. Fe²⁺
9.
The number of unpaired electrons in Mn²⁺ ion is:
A.
2
B.
5
C.
4
D.
3
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ANSWER :
B. 5
10.
Lanthanoid contraction is responsible for:
A.
Increase in oxidation states of lanthanoids
B.
Decrease in atomic radii in 3d series
C.
Increase in atomic radii from 4d to 5d series
D.
Similarity in atomic radii of 4d and 5d series transition elements
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ANSWER :
D. Similarity in atomic radii of 4d and 5d series transition elements
11.
The atomic radii of Zr and Hf are nearly the same because of:
A.
Same number of valence electrons
B.
Lanthanoid contraction
C.
Diagonal relationship
D.
Same effective nuclear charge
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ANSWER :
B. Lanthanoid contraction
12.
The cause of lanthanoid contraction is:
A.
Imperfect shielding of 4f electrons by other 4f electrons
B.
Increase in nuclear charge with no electron addition
C.
Perfect shielding of 4f electrons
D.
Penetration of 4f electrons into nuclear region
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ANSWER :
A. Imperfect shielding of 4f electrons by other 4f electrons