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An element (A) of group 2 gives brick re...

An element `(A)` of group `2` gives brick red colour in the Bunsen flame. `(A)` burns in nitrogen atmoshphere to give `(B)`, which gets hydrolysed to produce gas `(C )` and an alkaline solution `(D)`. The solution `(D)` on exposure to air produces a thin solid layer `(E)` on the surface. Identify `(A)` to `(E)`.

Text Solution

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Since `(A)` gives brick red colouration in the bunsen flame, `(A)` is calcium.
`underset((A))(3Ca)+N_(2)rarrunderset((B)("Calcium nitride"))(Ca_(3)N_(2))`
`Ca_(3)N_(2)+6H_(2)Orarrunderset((D))(3Ca(OH)_(2))+underset((C ))(2NH_(3))`
`underset((D))(Ca(OH)_(2))+underset(("Air"))(CO_(2))rarrunderset((E))(CaCO_(3))+H_(2)O`
Hence, `(A)` is calcium `(Ca),(B)` is `Ca_(3)N_(2),(C )` is `NH_(3),(D)` is `Ca(OH)_(2)` and `(E)` is `CaCO_(3)`.
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