Electronic Configuration of Elements, Extra Stability of Half-Filled and Completely Filled Orbitals. NEET Questions

Physical Chemistry - Atomic Structure

Electronic Configuration of Elements, Extra Stability of Half-Filled and Completely Filled Orbitals. MCQ Questions


13.
In which of the following pairs are both species iso-electronic with same configuration?
A.
Na⁺ and F⁻
B.
Cu and Zn
C.
Cr and Mn
D.
Fe²⁺ and Mn²⁺
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ANSWER :
A. Na⁺ and F⁻
14.
The maximum number of exchanges possible in 3d⁵ configuration is:
A.
5
B.
10
C.
20
D.
15
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ANSWER :
B. 10
15.
Which of the following sets of quantum numbers represents the highest energy electron in the ground state of chromium atom?
A.
n=3, l=1, ml=+1, ms=+1/2
B.
n=3, l=2, ml=+2, ms=+1/2
C.
n=3, l=2, ml=-2, ms=+1/2
D.
n=4, l=0, ml=0, ms=+1/2
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ANSWER :
D. n=4, l=0, ml=0, ms=+1/2
16.
The electronic configuration [Xe] 4f¹⁴ 5d¹⁰ 6s¹ corresponds to:
A.
Au
B.
Pt
C.
Ag
D.
Hg
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ANSWER :
A. Au
17.
Which of the following has the configuration [Ar] 3d¹⁰ 4s² 4p⁶?
A.
Xe
B.
Kr
C.
Br
D.
Ar
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ANSWER :
B. Kr
18.
Which of the following pairs represents species with same number of unpaired electrons?
A.
Cr³⁺ and Fe³⁺
B.
Fe²⁺ and Co³⁺
C.
Mn²⁺ and Fe³⁺
D.
Cu²⁺ and Zn²⁺
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ANSWER :
C. Mn²⁺ and Fe³⁺