Describe the importance of the following: (i) limestone (ii) cement (iii) plaster of paris.

(i) Importance of Limestone (CaCO₃)

⇒ Specially precipitated, CaCO₃ is extensively used in the manufacture of high quality paper.

⇒ It is also used in as an antacid, mild abrasive in toothpaste.

⇒ It is a constituent of chewing gum as a filler in cosmetics.

(ii) Importance of cement

⇒ Cement is an important building material.

⇒ It is used in concrete and in plastering.

⇒ It is used in the construction of bridges, dams and buildings.

(iii) Importance of Plaster of Paris

⇒ Plaster of Paris is extensively used in the building industry as well as plasters.

⇒ It is used in dentistry, in ornamental work and for taking the casts of statues and busts.

⇒ It is also used for immobilising (prevent from moving) the affected part of organ where there is bone fraction or sprain.