Question

Glass is made of the mixture of

• A. sand and silicates
• B. quartz and sand
• C. mica and quartz
• D. mica and silicates

Answer 1

The correct option is A

sand and silicates

Explanation for correct answer:-

Option (A) Sand and silicates

• Glass is a homogeneous mixture of super-cooled molten sodium silicate and calcium silicate.
• This consists of silica sand$({\mathrm{SiO}}_2)$, sodium oxide $\left({\mathrm{Na}}_2\mathrm{O}\right)$ from soda ash, calcium oxide $\left(\mathrm{CaO}\right)$from limestone/dolomite, dolomite$\left(\mathrm{MgO}\right)$, and feldspar $\left({\mathrm{Al}}_2{\mathrm{O}}_3\right).$
• These ingredients are mixed in the right proportion, and the entire batch is flown into a furnace heated to $1500°\mathrm{C}$.
• Hence it is the correct answer.

Explanation for incorrect answer:-

Option (B) Quartz$({\mathrm{SiO}}_2)$ is a mineral present in the sand.

• Quartz alone cannot be used in the preparation of glass.
• Hence, option (B) is incorrect.

Option (C) Mica and quartz

• Mica hydrous potassium, Aluminium silicate minerals, they can be made into thin sheets.
• They are heat tolerant, insulating, and dielectric, because of these properties they are used in electrical appliances.
• Hence, option (c ) is incorrect.

Option (D)Mica and silicates

• Mica is used in electrical appliances as they are heat tolerant. Therefore, it cannot be used in the preparation of glass.
• Hence, option (d) is incorrect.

Therefore, the correct answer is option (A) sand and silicates .