Question

Calcium imide on hydrolysis will give gas (B) which on oxidation by bleaching powder gives gas (C). Gas (C) on reaction with magnesium gives compound (D). (D) on hydrolysis gives again gas (B). (B), (C) and (D) respectively are:
A.\[N{{H}_{3}},~{{N}_{2}},~M{{g}_{3}}{{N}_{2}}\]
B.\[{{N}_{2}},~N{{H}_{3}},~M{{g}_{3}}{{N}_{2}}\]
C.\[{{N}_{2}},~{{N}_{2}}{{O}_{5}},~Mg{{\left( N{{O}_{3}} \right)}_{2}}\]
D.\[N{{H}_{3}},~N{{O}_{2}},~Mg{{\left( N{{O}_{2}} \right)}_{2}}\]

Answer 1

Hint: The initial hydrolysis of Calcium Imide resulting in the formation of compound B results in the formation of a gas and a precipitate. The gas B is a vital part of the agriculture industry due to its widespread use in the manufacture of fertilizers.

Step-by-Step Solution:
Let us go through each of these reactions a step at a time so as to ensure that no mistakes are made when trying to figure out the intermediary products formed as a result of this series of reactions.
In the first reaction, the hydrolysis of Calcium Imide results in the formation of Calcium Oxide precipitate and Ammonia gas which is released into the environment. Thus, we can conclude that gas B is Ammonia. The resultant chemical equation of the same reaction is:
$CaNH+{{H}_{2}}O\to CaO\downarrow +N{{H}_{3}}\uparrow $
In the second reaction, the oxidation of Ammonia with Bleaching Powder results in the formation of Calcium Chloride precipitate, Water and Nitrogen gas which is released into the environment. Thus, we can conclude that gas C is Nitrogen. The resultant chemical equation of the same reaction is:
\[3CaOC{{l}_{2}}+2N{{H}_{3}}\to 3CaC{{l}_{2}}\downarrow +3{{H}_{2}}O+{{N}_{2}}\uparrow \]
In the third reaction, the reaction of Nitrogen with Magnesium results in the formation of Magnesium Nitride precipitate. Thus, we can conclude that compound D is Magnesium Nitride. The resultant chemical equation of the same reaction is:
\[3Mg+{{N}_{2}}\to M{{g}_{3}}{{N}_{2}}\]
The final reaction results in the liberation of Ammonia gas all over again as a result of the hydrolysis of Magnesium Nitride.
\[M{{g}_{3}}{{N}_{2}}+6{{H}_{2}}O\to 3Mg{{(OH)}_{2}}+2N{{H}_{3}}\]
Therefore, we can safely conclude that the answer to this question is a).
Note: Mixing bleach and ammonia is extremely dangerous, since toxic vapours will be produced. The primary toxic chemical formed by the reaction is chloramine vapor, which has the potential to form hydrazine.