An element from IIA , On treatment with cold water, an element (A) reacts liberating a colorless, odorless gas (B) and a solution (C). Lithium is reacted with (B) yielding a solid product (D) which react with water to give a strongly basic solution (E). when CO₂ gas is bubbled through solution (C), a white ppt (F) is formed this dissolved forming solution (G) when more CO₂ is passed. Precipitate (F) effervesced when moistened with conc. HCI and give deep red coloration to a Bunsen burner flame. (F) on heating with excess of carbon at 2000°C give (H). Answer the following questions on the basis of above passage