Question:

Magnesium powder burns in air to give:

MgOonly

MgOandMg3N2

MgOandMg(NO3)2

Mg(NO3)2andMg3N2

Correct option is C. MgO and Mg3N2
Mg + air → MgO + Mg3N2
↓
Mg + 1/2O2 → MgO and 3Mg + N2 → Mg3N2