Chemistry - Solid State Question with Solution | TestHub

Ferromagnetic substances are those which are strongly attracted by a magnetic field and can be permanently magnetized. Examples include iron, cobalt, nickel, gadolinium, and ${\mathrm{CrO}}_2$.

$\mathrm{NaCl}$, ${\mathrm{C}}_6{\mathrm{H}}_6$, and ${\mathrm{H}}_2\mathrm{O}$ are diamagnetic substances.

Therefore, ${\mathrm{CrO}}_2$ is the ferromagnetic substance.

Answer: ${\mathrm{CrO}}_2$