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A metal (A) on heating in nitrogen gas...

A metal (A) on heating in nitrogen gas given compound B.B on treatment with `H_(2)O` givens a colourless gas which when passed throught `CuSO_(4)` solution given a dark blue - violet coloured solution . A and B respectivley are :

A

`Na and Na_3N`

B

`Na and NaNO_3`

C

`Mg and Mg_3N_2`

D

`Mg and Mg(NO_3)_2`

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The correct Answer is:
C
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