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Q.

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

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a

Mg3N2

b

Mg(NO3)2

c

NH3

d

MgO

answer is B.

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Detailed Solution

Y is Mg3N2.   
Magnesium react with nitrogen to from magnesium nitride. Magnesium nitride reacts with water to from ammonia and magnesium hydroxide. When ammonia gas is passed through CuSO4  Solution, it forms a blue precipitate.
 

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