Question

Heating limestone at a temperature of $1070\,K$, we get _________.

Answer 1

Hint :Limestone can also be written as $CaC{O_3}$. Limestone is formed when minerals calcite and aragonite which are different crystal forms of calcium, precipitate out of water in dissolved calcium.

Complete Step By Step Answer:
Limestone has the chemical formula of $CaC{O_3}$. The bond present here between calcium and carbonate ions is ionic. In the carbonate ion the carbon is attached to three oxygen atoms having one single bond with each and a resonant pi bond exists only between one of the oxygens and carbon.
The limestone is heated at a very high temperature.
The ions must have dissociated. There is a resonant pi bond on carbonate ion, for an instant one of the oxygens breaks the bond with carbon in the carbonate ion and the carbon forms two double bonds with the carbon resulting in the formation of carbon dioxide and the oxygen ion present in the solution reacts with highly electropositive calcium to form calcium oxide. The calcium oxide formation is indicated by the visibility of orange colour.
This calcium oxide when and if further reacts with water, forms calcium hydroxide, indicating that calcium oxide is also a base. Calcium hydroxide is called slaked lime.
Calcium carbonate or limestone on heating at $1070K$ disintegrates into calcium oxide and carbon dioxide.

Note :
Limestone has too many industrious uses. It is used as an abrasive for toothpaste, filler in plastics used in floor tiles and a building material. The most attractive property is that it can be converted to other chemicals very easily and it dissociates easily at high temperature.