Calcium on heating in $N_2$ yields an ionic compound $A$, which reacts with water to give $Ca(OH)_2$ and a gas $B$. Identify $A$ and $B$.
- A$CaN_2, NO$
- B$Ca_3N_2, NH_3$
- C$CaN_2, NH_3$
- D$Ca_3N_2, NO$
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