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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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The gives date suggest the following reactions
`underset((A))(3Ca) +N_(2) rarr underset((B))(Ca_(3)N_(2))`
`ca_(3)N_(2) + 6H_(2)O rarrunderset((C))( 3Ca(OH)_(2)) + underset((D)) (2NH_(3))`
`underset((E))(Ca(OH)_(2)) +CO_(2) rarr CaCO_(3) +H_(2)O`
It is given that a solution of C Become 'milk'` on bubbling carbon dioxide .Therefore it must be calcium or barium hydroxide which is more than magnessium hydroxide.
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