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Magnesium metal burns in air to form a w...

Magnesium metal burns in air to form a white ash . On treating the white ash with water , odour of ammonia is detected . Explain .

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Mg burns in air to form MgO and `Mg_(3) N_(2)`.
`2 Mg + O_(2) overset(Delta) (to) 2 MgO , 3 Mg + N_(2) overset(Delta)(to) Mg_(3) N_(2)`
Magnesium nitride on hydrolysis with `H_(2)O` (moisture) gives `NH_(3)` .
`Mg_(3)N_(2) + 6 H_(2)O to 3 Mg (OH)_(2) + 2 NH_(3)`
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