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Element (A) burns in nitrogen to give an...

Element (A) burns in nitrogen to give an ionic compound, `(B)` reacts with water to give (C) and (D). A solution of (C) becomes milky on bubbling carbon dioxide. Idendity (A),(B),(C) and (D)

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a. Since element (A) burns in nitrogen to give an ionic compound, therefore `(B)` must be a metal nitride
b. Since `(B)`, a metal nitride reacts with water, `(B)` is ionic nitride and the product formed, i.e., `(C)` and `(D)` are metal hydroxides and ammonia `(NH_(3))`
c. Since `(C)` becomes milky on bubbing `CO_(2),(C)` mustn by calcium hydroxide, `Ca(OH)_(2)`
All reactions involved in the equation can be explained as follows:
`underset((A))(3Ca_(s))+N_(2)(g)overset(Delta)tounderset((B))underset("Calcium nitride")(Ca_(3)N_(2)(s)`
`underset((B))(Ca_(3)N_(2)+6H_(2)Otounderset("hydroxide (C)")underset("Calcium")(Ca(OH)_(2))+underset("Ammonia (D))")(2NH_(3)(g))`
`Ca(OH)_(2)+CO_(2)tounderset((D))underset(("milkiness"))underset("carbonate")underset("Calcium")(CaCO_(3)darr)+H_(2)O`
Thus, `(A)=Ca,(B)=Ca_(3)N_(2),(C)=Ca(OH)_(2)(D)=NH_(3)`
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