Give the names and formula of the compounds indicated in the following statements.
(a). A compounds of `Ca` used in setting fractured bones.

Explanation

a. Plaster of paris, `CaSO_(4).(1)/(2)H_(2)O`
b. Calcium hydride, `CaH_(2)`(Hydrolith)
(C ). Bleaching powder, `CaOCl_(2).H_(2)O`
(d). Sorel cement, `MgCl_(2).5MgO.xH_(2)O`
(e). Anhydrone, `Mg(ClO_(4))_(2)`
It has strong affinity for water giving `Mg(ClO_(4))_(2).6H_(2)O`. It loses all six water molecules of crystallisation at `250^(@)C` and drying property is regenerated.
(f). Calcium oxide, `CaO`
(g). Calcium cyanamide, `CaCN_(2)` (nitrolim)
(h). Calcium hydride, `CaH_(2)`
`CaH_(2)+2H_(2)OrarrCa(OH)_(2)+2H_(2)`. Whereas in case of magnesium, due to the availability of low-lying `d-`orbitals of suitable energy, `Mg` can expand its coordination number to `6`.
Hence, hydrated magnesium ion exists as `[Mg(H_(2)O)_(6)]^(2+)`.