Question

The structure of Silica is:
A.Layer lattice
B.Tetrahedral
C.Trigonal
D.Linear

Answer 1

Silica exists in a polymeric form. It is widely found in nature as quartz.
Silica or $Si{O_2}$ is a white crystalline compound found in quartz minerals. Silica acts as an important ingredient in the manufacturing of a wide range of minerals.

Complete step by step answer:
Silicon is the 14th element of the periodic table. It comes under the carbon family and possesses the properties of carbon. Silica is the compound of Silicon and oxygen. Silica has three main forms- quartz, tridymite, and cristobalite.
Silica is a colourless, odorless crystal found in different colors. Touching silica can even cause cancer.
Structure- Silica has a chemical formula $Si{O_2}$. You might think that it will exist as a linear compound or trigonal planar but it exists as a polymer. There is a repeating unit of $Si$ and oxygen. Every $Si$ atom is attached to 4 oxygen atoms. Every oxygen atom is bonded to two $Si$ atoms providing it $s{p^3}$ hybridization. Hence, the structure of silica is tetrahedral not linear or planar.

So, the correct answer is option B.

Note:
Silica is a sand or quartz which is used as a starting material for the preparation of Silicon by removal of oxygen. Reducing silica is the key step for the production of silicon in electric arc furnaces.
$Si{O_2} + 2C \to Si + 2CO(g)$
Rests of the impurities are removed by further chemical processes.
Silica is used in the production of glass. It is used in the pharmaceutical industries. It is also used to remove tooth plaque from teeth. It is used to produce elemental silicon.