MCQ
The oxide that shows magnetic property is :
- A$SiO _{2}$
- ✓$Mn _{3} O _{4}$
- C$Na _{2} O$
- D$MgO$
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Atomic mass of $\mathrm{K}=39, \mathrm{Mn}=55, \mathrm{O}=16]$