A metal M reacts with N₂ to give a compound A' (M₃N) . 'A' on heating at high temperature gives back 'M' and 'A' on reacting with H₂O gives a gas ' B'. ' B' turns CuSO₄ solution blue on passing through it. A and B can be

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Mg and NH₃

AI and NH₃

Li and NH₃

Na and NH₃

answer is B.

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Detailed Solution

Lithium form nitride on heating with nitrogen. Lithium nitride gives ammonia when heated with H₂O. Ammonia gas form tetrammine copper complex with CuSO₄ solution.
$\begin{array}{l} 6 Li + N_{2} \to 2 {Li}_{3} N \\ {Li}_{3} N + 3 H_{2} O \to 3 LiOH + {NH}_{3} \\ {CuSO}_{4} + 4 {NH}_{3} \to [Cu {({NH}_{3})}_{4}] {SO}_{4} \end{array}$