Question

Which of the following statements is true about glass?
A.Arrangement of silicate units is similar to that of liquid state.
B.Arrangement of silicate units is similar to that of solid state.
C.It has low viscosity and hence is not a true solid.
D.It has high viscosity with the sharp melting point and hence is a solid.

Answer 1

Hint: Glass is principally made up of silica with varying degrees of calcium oxide, sodium oxide, aluminum oxide, barium oxide, boric oxide, potassium oxide, and magnesium oxide. The high melting point of the glass is due to the presence of silica. These glasses are classified into four types, Type I, Type II, Type III, and Type IV glass based on the degree of chemical/ hydrolytic resistance to a water attack.

Complete step by step answer:
Glass is an amorphous substance, it is made of chemical components such as silica, (silica dioxide or quartz), the primary constituent being sand. The silicates are arranged as tetrahedral units, they are similar to that of liquid states. This is the reason the glass is amorphous in the state.
Thus, option A is the right answer.
The arrangement of silicate units is similar to that of the liquid state is true among the following.

Note:
Float glass is produced by floating molten glass over a bed of liquid tin. The floating glass is made from a mixture of sand, limestone, soda ash, dolomite, iron oxide, and salt cake which are heated to a temperature of 1500 degrees Celsius. Bulletproof glass is actually constructed of either strong plastics such as polycarbonate or layers of laminated glass. Borosilicate glass is a type of heat resistant glass which is most commonly known as Pyrex. Heat resistant glass is not affected by changes in temperature due to it having a low thermal expansion coefficient. Rapid heating can cause it to break but instead of shattering like float glass, it is most likely to fracture in one place. Heat resistant glass is less dense than normal glass.