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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`

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The correct Answer is:
B
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