Magnesium metal is heated to redness in the presence of nitrogen and on cooling water is added. The gas evolved is:

N_{2}

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H_{2}

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N H_{3}

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O_{2}

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Solution

The correct option is C $N H_{3}$
The gas evolved is $N H_{3}$ .
When magensium is heated to redness in the presence of nitrogen, it forms magnesium nitride.
$3 M g + N_{2} \to M g_{3} N_{2}$
This magnesium nitride when reacts with water forms ammonia gas.
$M g_{3} N_{2} + 6 H_{2} O \to 3 M g (O H)_{2} + 2 N H_{3}$

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Similar questions

A piece of Mg ribbon is heated to redness in an atmosphere of Nitrogen and on cooling with water. The evolved gas is

(p) Nitriding	(I) Process of heating steel to redness and then cooling it very slowly
(Q)Annealing	(II) Process of heating steel in presence of $N H_{3}$ and producing hard coating of Iron Oxide on the surface of steel
(R) Tempering	(II) Process of heating steel to redness and then cooling it suddenly by plunging it into water or oil.
(S) Quenching	(IV) Process of heating quenched steel to a temperature well below redness and then cooling it slowly

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