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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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A is ammonia and B is calcuim carbonate
`Ca+N_(2) rarr underset("White powder")(Ca_(3)N_(2))`
`Ca_(#) +H_(2)O rarr Ca(OH)_(2) +underset((A))(NH_(3))`
`Ca(OH)_(2) overset(COO_(2))rarr underset((B))(CaCO_(3))+H_(2)O`
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