Question

The commercial name for calcium oxide is:
a.) Quick lime
b.) Milk of lime
c.) Slaked lime
d.) Limestone

Answer 1

Hint: The chemical substances which are composed of many identical and dissimilar atoms which are bound together by chemical bonds are known as chemical compounds. Calcium oxide is a chemical compound made up from calcium and oxygen atoms. \[CaO\] is also known as caustic lime.

Complete step by step answer:
Calcium oxide is prepared when we heated calcium carbonate in a special lime kiln at the temperature of ${500^ \circ }C$ to ${600^ \circ }C$ .
$CaC{O_3}(s) \to CaO(s) + C{O_2}(g)$
Calcium Oxide is non chromatic crystalline solid and its color is white to grey off color.
Some reactions including calcium oxide are as follows:
Quick lime reacts with water, it forms slaked lime. It is called slaking of lime.
$CaO + {H_2}O \to Ca{(OH)_2}$
Calcium oxide is a basic oxide which reacts with acid and gives calcium sulphate which is a salt.$CaO + {H_2}S{O_4} \to CaS{O_4} + {H_2}O$
When calcium oxide reacts with silicon dioxide it gives calcium silicate as a product.
$CaO + Si{O_2} \to CaSi{O_3}$
When calcium oxide reacts with ${P_2}{O_5}$ it gives calcium phosphate.
$3CaO + {P_2}{O_5} \to C{a_3}{(P{O_4})_2}$
Because of these properties lime is used as flux in metallurgy, which is used in removing impurities.
Conclusion: When calcium reacts with water it is called calcium hydroxide. When it is in pure state it is called calcium oxide or Quicklime. Calcium oxide has a higher density than hydrated lime. So the resulting lime has a density of $35lb/f{t^3}$ .
Hence from the above discussion we can conclude that the commercial name for calcium oxide is quick lime.

So, the correct answer is Option a.

Note: Quick lime is a very useful chemical product. It is used in most of the sectors like it is used for medical purposes, plant, insecticides and animal food. It is used as lab reagents and also it is used in production of paper, cement and high grade steel.