Question

A metal X on heating in nitrogen gas gives a compound Y. Compound Y on treatment with \[{H_2}O\] gives a colourless gas which when passed through \[CuS{O_4}\] solution gives a blue colour. Then, compound Y is:
A. \[Mg{(N{O_3})_2}\]
B. \[M{g_3}{N_2}\]
C. \[N{H_3}\]
D. \[MgO\]

Answer 1

Hint: We have studied that metal on heating with nitrogen gas and when dissolved in the copper sulphate solution forms the blue colour.

Complete step by step answer:
Magnesium nitride can be used to prepare different nitride compounds with corrosion resistance and high hardness, wear resistance, high-temperature resistance, also high thermal conductivity properties.
As we know that, when magnesium metal is heated in nitrogen then it forms magnesium nitride.
\[3Mg + {N_2} \to M{g_3}{N_2}\]
Hydrolysis of magnesium nitride gives magnesium hydroxide and ammonia.
\[M{g_3}{N_2} \to Mg{(OH)_2} + N{H_3} \uparrow \]
When ammonia gas is properly dissolved in the copper sulphate solution then blue colour is obtained.

So, the correct answer is Option B.

Note: In the first practical synthesis of borazon, magnesium nitride was used as the catalyst in the reaction. Magnesium hydroxide is an inorganic compound which is naturally found in the form of mineral brucite state. Magnesium hydroxide can also be used as an antacid or a laxative in either an oral liquid form or in the chewable tablet form. Moreover, magnesium hydroxide is also having smoke suppressant and flame retardant properties and it is thus used commercially as a fire retardant worldwide. It can also be used typically as a deodorant or also for the relief of aphthous ulcers or cancer sores. As an antacid, magnesium hydroxide suspensions first neutralize the gastric acid and then react with hydrochloric acid in the abdominal cavity to form the magnesium chloride and water. Thus, it is practically insoluble in water and also does not have much effect until it is reacted with the HCl in the abdominal cavity.