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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. Identity the compound (A) and (B)

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Gas is ammonia and solid `B` is calcium
`3Ca+N_(2)rarrCa_(3)N_(2)`
`Ca_(2)N_(2)+6H_(2)Orarr3Ca(OH)_(2)+2NH_(3)(A)`
`Ca(OH)_(2)+CO_(2)rarrCaCO_(3)(B)+H_(2)O`
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