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Element 'A' burns in nitrogen to give an...

Element 'A' burns in nitrogen to give an ionic compound 'B' which reacts with water to give 'C' and 'D'. The solution of 'C' becomes milky on bubbling carbon dioxide gas. Identify the compounds A, B, C and D.

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The reactions indicate that the compoud 'C' is `Ca(OH)_(2)` and the element 'A' is , therefore, calcium. The reactions involved are :
`{:(underset((A))(3Ca)+N_(2) overset("heat")to underset((B))(Ca_(3)N_(2))),( underset((B))(Ca_(3)N_(2))+6H_(2)Oto underset((C))(3Ca(OH)_(2))+underset((D))(2NH_(3))),(underset((C))(Ca(OH)_(2))+CO_(2) to underset(("Milky"))(CaCO_(3))+H_(2)O):}`
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