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A metal M reacts with N(2) to give a com...

A metal `M` reacts with `N_(2)` to give a compound `'A'(M_(3)N)`. 'A' on heating at high temperature gives back `'M'` and `'A'` on reacting with `H_(2)O` gives a gas 'B'.'B' turns `CuSO_(4)` solution blue on passing through it `A` and `B` can be

A

Al and `NH_(3)`

B

Li and `NH_(3)`

C

Na and `NH_(3)`

D

Mg and `NH_(3)`

Text Solution

Verified by Experts

The correct Answer is:
B
Lithium form nitride on heating with nitrogen. Lithium nitride gives ammonia when heated with `H_(2)O`. Ammonia gas form tetraammine copper complex with `CuSO_(4)` solution.
`6Li+N_(2)to2Li_(3)N`
`Li_(3)N+3H_(2)Oto3LiOH+NH_(3)`
`CuSO_(4)+4NH_(3)to[Cu(NH_(3))_(4)]SO_(4)`.
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