Answer
$Fe_{3}O_{4}$ is ferrimagnetic and $Fe_{2}O_{3}$ is antiferrimagnetic at room temperature.
Work Step by Step
In $Fe_{3}O_{4}$, spins of electrons in Fe 2+ and Fe 3+ are anti parallel and hence cancel out each others effect but Fe 3+ ions are more so it is ferrimagnetic. In $Fe_{2}O_{3}$ spins are parallel hence it is antiferrimagnetic.
