Which of the following is not a ferromagnetic material?
Correct answer: D. Barium
- A. Iron
- B. Nickel
- C. Cobalt
- D. Barium
Explanation
Barium is not a ferromagnetic material. Ferromagnetic materials have a strong magnetic response to an external magnetic field, and they can retain their magnetization even after the external field is removed. Iron, Nickel, and Cobalt are examples of ferromagnetic materials. Barium is a diamagnetic material, which means it is weakly repelled by both poles of a magnet. It does not exhibit the strong magnetic properties characteristic of ferromagnetic materials. Therefore, option d is correct.
This question appeared on the ETEA MDCAT 2014 paper, which you can sit online with every answer explained.
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About Electronic Structure of d-Block Elements
The electronic structure of d-block elements covers the filling of the (n-1)d and ns orbitals, general electronic configurations, and the exceptions shown by chromium and copper. It explains how partially filled d orbitals produce variable oxidation states, coloured ions, magnetic behaviour and complex formation, while distinguishing transition elements from elements with completely filled d subshells.
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