Chapter 21, Problem 34PS

Interpretation Introduction

Interpretation: To predict which option is not an industrial process among the given processes.

Concept introduction: Calcium is one of the most abundant elements found on earth. It is an alkaline earth metal and belongs to group $\text{2A}$ of the periodic table. Its compounds have a high melting point. Calcium occurs in various minerals that are found on earth’s surface. Some common minerals are limestone, dolomite, slaked lime, gypsum and chalk.

Calcium Oxide is quick lime and is a white, amorphous solid. Calcium hydroxide is known as slaked lime. Both are slightly soluble in water and dissolve in acids. Calcium carbonate is present in limestone and chalk. Calcium salts of fluoride and phosphates are also another important material. The formula for calcium fluoride is ${\text{CaF}}_{\text{2}}$. The phosphates salt of calcium is known as apatites. Apatites have a general formula of ${\text{Ca}}_{\text{5}}\text{X}{\left({\text{PO}}_{\text{4}}\right)}_{\text{3}}$.

These calcium minerals are used as raw materials for the various large-scale industrial process to produce materials.