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 blue colour. Y is

  1. A

    MgNO32

  2. B

    Mg3N2

  3. C

    NH3

  4. D

    MgO 

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    Solution:

    3Mg+N2ΔXMg3N2y Mg3N2+6H2O3Mg(OH)2 +2NH3colourless CuSO4+4NH3CuNH34SO4blue

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