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Each question is provided with 4-alternative answers. One or more than one of them are correct answers. Indicate the correct answer by A,B,C,D.
A metal M reacts with nitrogen gas to afford $$\text{M}_3\text{N}$$. $$\text{M}_3\text{N}$$ on heating at high temperature gives back M and on reaction with water produces gas B. Gas B reacts with aqueous solution of $$\text{CuSO}_4$$ to form a deep blue compound. M and B respectively
Lithium is the only alkali metal that combines directly with nitrogen, forming $$\text{Li}_3\text{N}$$. With water, $$\text{Li}_3\text{N} + 3\text{H}_2\text{O} \rightarrow 3\text{LiOH} + \text{NH}_3$$, and ammonia gives the deep blue $$[\text{Cu(NH}_3)_4]^{2+}$$ with $$\text{CuSO}_4$$. So M is Li and B is $$\text{NH}_3$$.
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