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Q.

The oxide that shows magnetic property is

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a

Mn3O4

b

Na2O

c

MgO

d

SiO2

answer is A.

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Detailed Solution

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The oxide of Mn shown as Manganese(II,III) oxide it is present in two oxidation states +2 and +3 and the formula is written as MnO·Mn2O3.In  Mn(II)  five unpaired electrons are present. 3d5. Due to which it is highly magnetic in nature. To calculate magnetic moment we use the equation μ=√n (n+2), where n is the number of unpaired electrons. Greater the n value, greater will be the magnetic moment

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