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Calcium burns in nitrogen to produce a w...

Calcium burns in nitrogen to produce a white powder which dissolves in sufficient water to produce a gas (A) and alkaline solution. The solution on exposure to air produce a thin solid layer of (B) on the surface. Indentity the compound (A) and (B)

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`Ca` on heating with `N_(2)` produces calcium nitride. `Ca_(2)N_(2)`, a white powder. `Ca_(3)N_(2)` on reaching with water produces ammonia gas `(NH_(3))`. i.e. (A) and alkaline solution, `Ca (OH)_(2). Ca(OH)_(2)` on exposure to air, reacts with atmospheric `CO_(2)` to give insoluble `CaCO_(3)`. hence, `(A)=NH_(3),(B)=CaCO_(3)`.
`3Ca+N_(2)overset(Delta)toCa_(3)N_(2)`
`Ca_(3)N_(2)+6H_(2)Otounderset(("alkaline solution"))underset("hydroxide")underset("Calcium")(3Ca(OH)_(2))+(2NH_(3))+_((A))`
`Ca(OH)_(2)+underset((air))(CO_(2))tounderset((B))(CaCO_(3))darr+H_(2)O`
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