Chemistry Transition Elements MDCAT 2010
PMDC Verified Question 67 of 68
The paramagnetic character of substances is due to the presence of
A
Bond pairs of electrons
B
Unpaired electrons in the atom or molecule
C
Lone pairs of electron
D
Paired electrons in the valence shell of atoms
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Unpaired electrons in the atom or molecule
Concept:

Paramagnetism is a magnetic property of materials where they are weakly attracted to an external magnetic field. This behavior fundamentally arises from the presence of one or more unpaired electrons.

Solution:

  • When electrons are unpaired, their individual spin magnetic moments do not cancel each other out.


  • This results in a net magnetic dipole moment that aligns parallel to an applied external magnetic field, producing a net attraction.


Why other options are incorrect:

  • Bond pairs, lone pairs, and paired electrons: These all consist of paired electrons with opposite spins ( Pauli exclusion principle ), which cancel each other's magnetic fields, resulting in diamagnetism (weak repulsion), not paramagnetism.

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