The oxide that shows magnetic property is :
$\mathrm{SiO}_{2}$
$\mathrm{Mn}_{3} \mathrm{O}_{4}$
$\mathrm{Na}_{2} \mathrm{O}$
$\mathrm{Mg} \mathrm{O}$
Correct Option: , 2
$\mathrm{Mn}_{3} \mathrm{O}_{4}$ shows magnetic properties.
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