$A$ metal $X$ on heating in a stream of nitrogen gives $Y$. $Y$ on reaction with ${H_2}O$ gives a colorless gas which,when passed through a $CuSO_4$ solution,gives a blue color. What is $Y$?
- A$Mg(NO_3)_2$
- B$Mg_3N_2$
- C$NH_3$
- D$MgO$
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