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Magnesium powder burns in air to give:

1. Mg(NO3)2 and Mg3N2
2. MgO and Mg3N2
3. MgO only
4. MgO and Mg(NO3)2

Correct answer: MgO and Mg3N2

Solution

When magnesium powder burns in air, it reacts with oxygen to form magnesium oxide (MgO) and can also react with nitrogen present in the air to produce magnesium nitride (Mg3N2), making option B the correct choice.

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