Question

Which of the following substance is antiferromagnetic?

• A. $MnO$
• B. $Cr{O}_2$
• C. $F{e}_3{O}_4$
• D. $NaCl$

Answer 1

The correct option is A $MnO$

Antiferromagnetism is a type of magnetism in solids in which adjacent ions behave as a tiny magnet. These ions align themselves at low temperature.
MnO is antiferromagnetic. NaCl is diamagnetic. $Cr{O}_2$ is ferromagnetic. $F{e}_3{O}_4$ is ferrimagnetic at room temperature, but paramagnetic at 850 K