Hydrogen reacts with a metal (A) to give an ionic hydride (B).The metal (A) gives brick red colour with bunsen blame.The hydride formed is commonly known by its trade name. The compound (B) on treating with water gives bach `H_2` and ( C).Identify group of (A)

Answer

2

Explanation

The given reactions are :
(i)Ca give brick red colour to flame
(ii)`underset((A))Ca+H_2tounderset((B))(CaH_2)` (hydrolith, trade name)
(iii)`underset((B))(CaH_2)+2H_2Otounderset( (C ))(Ca(OH))_2+H_2`