Element `A` burns in nitrogen to give an ionic compound `B`. Compound `B` reacts with water to give `C` and `D`.`A` solu

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Q 2626480371.     Element `A` burns in nitrogen to give an ionic compound `B`. Compound `B` reacts with water to give `C` and `D`.`A` solution of `C` becomes 'milky¬∑ on bubbling carbon dioxide gas. Identify `A, B, C` and `D`.
JEE 1997

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