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Some important compounds of magnesium and calcium - class-XI
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Magnesium metal is heated to redness in the presence of nitrogen and on cooling water is added. The gas evolved is:
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A
$NH _{3}$
💡 Explanation:
The gas evolved is $NH _{3}$.
When magensium is heated to redness in the presence of nitrogen, it forms magnesium nitride.
$ 3Mg + N _{2} \rightarrow Mg _{3}N _{2}$
This magnesium nitride when reacts with water forms ammonia gas.
$Mg _{3}N _{2} + 6H _{2}O \rightarrow3Mg(OH) _{2} + 2NH _{3}$