Q 1179191016.     Calcium burns in nitrogen to produce a white powder which dissolves in sufficient water to produce a gas `A` and an alkaline solution. The solution on exposure to air produces a thin solid layer of `B` on the surface. Identify the compounds `A` and `B`.


JEE 1996
A

`A = NH_3, B = CaCO_3`

B

`A = CH_4, B = CaCO_3`

C

`A = NH_3, B = NaCO_3`

D

`A = H_2O, B = MgCO_3`

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