Select the Incorrect statement from the following:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Paramagnetic substances are repelled by the applied magnetic field
In a magnetic field, diamagnetic substances (all electrons paired) are repelled, while paramagnetic substances, which have unpaired electrons, are attracted.
Option (1) Paramagnetic substances are repelled by the applied magnetic field — The incorrect statement. Paramagnetic substances are attracted by a magnetic field; it is diamagnetic substances that are repelled.
Option (2) Ferromagnetism is an extreme form of paramagnetism — A correct statement. Both arise from unpaired electrons; in ferromagnetic substances the spins are aligned in domains, so the attraction is very strong.
Option (3) The magnetic moment of coordination compounds can be measured by the magnetic susceptibility experiments — A correct statement. The magnetic susceptibility gives the magnetic moment, and from it the number of unpaired electrons.
Option (4) Magnetic moment is determined by the number of unpaired electrons and is calculated by using the ‘spin-only’ formula — A correct statement. For n unpaired electrons, μ = √n(n+2) BM.
NCERT (2026-27 edition):
Magnetic Properties
