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Question
Explain, why ammonia is evolved when water is added to the product formed, when magnesium is burned in air.
Short/Brief Note
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Solution
Magnesium on burning in air produces magnesium nitride.
\[\ce{Mg + N2 → Mg3N2}\]
When this magnesium ni tride comes in contact with water ammonia gas is released
\[\ce{Mg3N2 + 6H2O -> 3Mg(OH)2 + 2NH3}\]
Key: Ammonia is formed from metal nitrides
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