Chemistry Transition Elements UHS 2023
PMDC Verified Question 13 of 68
Which of the following transition metal show \( 3d^{5} \) configuration in its +2-oxidation state
A
\( Cu^{+2} \)
B
\( Fe^{+2} \)
C
\( Mn^{+2} \)
D
\( Zn^{+2} \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: \( Mn^{+2} \)
Concept:

Determine the ground state configuration of the neutral metals and remove 2 electrons to see which results in a \(3d^5\) state.

Solution:

  • Manganese (Mn, Z=25):
    Neutral: \([Ar] \; 3d^5 \; 4s^2\)
    \(Mn^{2+}\) (lose two \(4s\) e-): \([Ar] \; 3d^5\).


  • Iron (Fe, Z=26):
    Neutral: \([Ar] \; 3d^6 \; 4s^2\)
    \(Fe^{2+}\): \([Ar] \; 3d^6\).


  • Copper (Cu, Z=29):
    Neutral: \([Ar] \; 3d^{10} \; 4s^1\)
    \(Cu^{2+}\): \([Ar] \; 3d^9\).


Why other options are incorrect:

  • Only Manganese perfectly reduces to a half-filled, highly stable \(3d^5\) configuration upon losing 2 electrons.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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