Chemistry
State your observation – Water is added to the product formed, when Al is burnt in a jar of nitrogen gas.
Ammonia
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Answer
When Al metal is burnt in a jar of nitrogen gas, its nitride i.e., AlN is formed. When warm water is added to AlN, it undergoes hydrolysis and is decomposed by warm water to give pungent smelling ammonia gas. The corresponding insoluble metal hydroxide (i.e., Al(OH)3) is precipitated out. The reactions are shown below:
2Al + N2 ⟶ 2AlN
AlN + 3H2O ⟶ Al(OH)3 + NH3 [g]
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