Which of the following is a ferromagnetic substance? — Solid State Chemistry Question

💡 Solution & Explanation

Chromium dioxide ($CrO_2$) is a well-known ferromagnetic solid that is strongly attracted by magnetic fields and is used in magnetic recording tapes. $Fe_3O_4$ is ferrimagnetic, while $Fe_2O_3$ and $Cr_2O_3$ are anti-ferromagnetic. Therefore, correct answer is D.