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)`.

Calcium burns in nitrogen to produce a white powder which dissolves in sufficient water to produce a gas (A) and alkaline solution. The solution on exposure to air produce a thin solid layer of (B) on the surface. Identity the compound (A) and (B)

Calcium burns in nitrogen to produce a white powder which dissolves in sufficient water to produce a gas (A) and alkaline solution. The solution on exposure to air produce a thin solid layer of (B) on the surface. Indentity the compound (A) and (B)

Calcium burns in nitrogen to produce a white powder which dissolves in sufficient water to produce a gas (A) and alkaline solution. The solution on exposure to air produce a thin solid layer of (B) on the surface. Indentity the compound (A) and (B)

alkali metal (A) on flame test gives a crimson red colour to the Bunsen flame. (A) on heating in air gives compound (B), and (B) further on hydrolysis gives (C ) and gas (D). Gas (D) with Nessler's reagent gives a brown precipitate Identify (A), (B), (C ) and (D).

A sulphide ore (A) on roasting leaves a residue (B) . (B) on heating with chlorine gives (C ) , sulphide in water, addition of excess potassium iodide to a solution of (C ) gives a solution (D) A brown precipitate (E) is formed when a solution of ammonium sulphate is added to an alkaline a solution of (D) . Identify (A) to (E) .