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Question

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

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A
Na and Na3N
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B
Mg. Mg(NO3)3
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C
Mg and Mg3N2
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D
Na, NaNO3
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Solution

The correct option is C Mg and Mg3N2
The given metal is Mg. It gives Mg3N2 when heated in nitrogen gas:

3Mg+N2ΔMg3N2

Mg3N2 on treating with water gives colourless ammonia.

Mg3N2+6H2O3Mg(OH)2+2NH3

Ammonia reacts with CuSO4 to form blue complex [Cu(NH3)4]SO4

CuSO4+4NH3[Cu(NH3)4]SO4

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