Question

$\mathrm { Fe } _ { 3 } \mathrm { O } _ { 4 }$ is ferromagnetic at room temperature but at 820 K, it becomes

• A. Diamagnetic
• B. Ferrimagnetic
• C. Paramagnetic
• D. Anti- ferromagnetic

Answer 1

Answer: (C)

Paramagnetic

Answer 2

At 850 K, $\mathrm { Fe } _ { 3 } \mathrm { O } _ { 4 }$ becomes paramagnetic.