Give the names and formulae of the compounds indicated by the following statements :
(a) A compound of Ca used in setting fractured bones.
(b) A compound of Mg, S, O and H used as purgative in medicines.
(c ) A compound of Ca and C used for the production of acetylene.
(d) A compound of Ca, C and N used as fertillizer.
(e) A compound of Ca and H Which upon reacting with water gives `H_(2)`.

Explanation

`{:((a) "Plaster of pairs",: CaSO_(4).1//2H_(2)O),((b) "Epson salt",:MgSO_(7).H_(2)O),((c )"Calcium carbide",:CaC_(2)),((d) "Calcium cyanamide (nitrolim)",CaCN_(2)),((e )"Calcium hydride (hydrolith)",:CaH_(2)):}`