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Q.

A metal (A) on heating in nitrogen gas gives compound B. B on treatment with H2O gives a colourless gas which when passed through CuSO4 solution gives a dark blue-violet coloured solution. A and B respectively, are:

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a

Na & Na3N

b

Na & NaNO3

c

Mg & Mg3N2

d

Mg & Mg(NO3)2

answer is C.

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Detailed Solution

3Mg+N2→Mg3N2    (A)                   (B) Mg3N2+6H2O→3MgOH2+2NH3    (B)     CuSO4+4NH3→CuNH34SO4Dark blue
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A metal (A) on heating in nitrogen gas gives compound B. B on treatment with H2O gives a colourless gas which when passed through CuSO4 solution gives a dark blue-violet coloured solution. A and B respectively, are: