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Question

Magnesium powder burns in air to give
  1. MgO and Mg3N2
  2. MgO only
  3. MgO and Mg(NO3)2
  4. Mg(NO3)2 and Mg3N2


Solution

The correct option is A MgO and Mg3N2
Magnesium powder burns in air to give MgO and Mg3N2. MgO does not combine with excess oxygen to given any superoxide. Mg reacts with nitrogen to form magnesium nitride (Mg3N2).
Mg+O2MgO
3Mg+N2Mg3N2

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