Question

The constituents used in the manufacturing of different types of glasses are given below.

Silica(${\text{SiO}}_2$), Sodium Carbonate (${\text{Na}}_2{\text{CO}}_3$), Calcium Carbonate (${\text{CaCO}}_3$), Potassium Carbonate(${\text{K}}_2{\text{CO}}_3$), Boron Oxide (${\text{B}}_2{\text{O}}_3$), Alumina (${\text{Al}}_2{\text{O}}_3$) and Lead Oxide ($\text{PbO}$)

Choose the option/s that correctly matches the constituents and its use.

• A. ${SiO}_2$, ${Na}_2{CO}_3$ and ${CaCO}_3$$\Rightarrow$ Used in soft glass
• B. ${SiO}_2$, ${Al}_2{O}_3$ and ${CaCO}_3$$\Rightarrow$Used in Borosilicate glass
• C. ${SiO}_2$, $K_2{CO}_3$ and $PbO$$\Rightarrow$Used in optical glass
• D. ${SiO}_2$, $K_2{CO}_3$ and $B_{2}O3$$\Rightarrow$ Used in hard glass

Answer 1

Answer: (A), (C)

The correct options are
A

${SiO}_2$, ${Na}_2{CO}_3$ and ${CaCO}_3$$\Rightarrow$ Used in soft glass

C

${SiO}_2$, $K_2{CO}_3$ and $PbO$$\Rightarrow$Used in optical glass

The table given below shows the composition of different types of glasses with their usage:
$$\begin{array}{cc}\text{Constituents}& \text{Use}\\ {\text{SiO}}_2,{\text{Na}}_2{\text{CO}}_3\text{and}{\text{CaCO}}_3& \text{Used in soft glass}\\ {\text{SiO}}_2,{\text{K}}_2{\text{CO}}_3\text{and}{\text{CaCO}}_3& \text{Used in hard glass}\\ {\text{SiO}}_2,{\text{Al}}_2{\text{O}}_3\text{and}{\text{B}}_2{\text{O}}_3& \text{Used in Borosilicate glass}\\ {\text{SiO}}_2,{\text{K}}_2{\text{CO}}_3\text{and}\text{PbO}& \text{Used in optical glass}\end{array}$$