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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$(I)$ $AgNO_3$ $(II)$ $CaCO_3$
$(III)$ $Pb(NO_3)_2$ $(IV)$ $Na_2CO_3$