Chemistry Transition Elements BUMHS 2024
PMDC Verified Question 12 of 68
Transition metal compounds containing unpaired electrons are
A
Always diamagnetic
B
Attracted by the magnet
C
Not attracted by the magnet
D
Repelled by the magnet
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Attracted by the magnet
Concept:

The macroscopic magnetic properties of transition metal compounds are determined by the quantum mechanical spin of their \(d\)-electrons.

Solution:

  • Every electron possesses a property called "spin," which generates a tiny magnetic field.


  • If two electrons are paired in the same orbital, their spins are opposite (Pauli Exclusion Principle) and their magnetic fields cancel each other out.


  • If an electron is unpaired, its magnetic field is uncancelled. The atom behaves like a small magnet.


  • When exposed to an external magnetic field, these uncancelled moments align with the field, causing the material to be physically attracted by the magnet (paramagnetism).


Why other options are incorrect:

  • Diamagnetic / Repelled: This only happens if all electrons in the compound are perfectly paired (e.g., \(Zn^{2+}\) compounds).

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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