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A metal X on heating in nitrogen gas gives Y.Y on treatment with H2O gives a colourless gas which when

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A metal X on heating in nitrogen gas gives Y.Y on treatment with H2O gives a colourless gas which when passed through CuSO4 solution gives a intense blue colour. Y is : 

(A) Mg(NO3)2 

(B) Mg3N2 

(C) NH3 

(D) MgO

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Blue colour Y is Mg3N2.

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