Q.

When magnesium burns in air, compounds of magnesium formed are magnesium oxide and?

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a

Mg3N2

b

MgCO3

c

Mg(NO3)2

d

Mg(NO2)2 

answer is A.

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Detailed Solution

        When magnesium burns in air, it combines with nitrogen to form magnesium nitride.
        When magnesium burns in the air, it mainly combines with oxygen to form magnesium oxide.
        When magnesium burns in air, the compounds of magnesium become magnesium oxide (MgO) and magnesium nitride (Mg3N2).
  2Mg + O2 = 2MgO              &           3Mg + N2 = Mg3N2
 
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