Identify the incorrect statement about $\mathrm{SiO}_2$ (silica) from the following.

Identify the incorrect statement about $\mathrm{SiO}_2$ (silica) from the following.
  1. It is highly reactive due to low $\mathrm{Si}-\mathrm{O}$ bond enthalpy.
  2. It is a covalent three-dimensional network solid.
  3. Quartz, the crystalline form of silica, is used as a piezoelectric material.
  4. An amorphous form of silica is used in filtration plants.

Solution

$\mathrm{SiO}_2$ is a covalent three dimensional network solid.
Silica (commonly known as quartz) is $\mathrm{SiO}_2$ which is usually used to manufacture glass, ceramics, piezoelectric materials. Most common use of silica is in water filtration, because of its uniform shape and size, it is an effective filtration bed that removes contaminants from water. $\mathrm{SiO}_2$ is less reactive due to high $\mathrm{Si}-\mathrm{O}$ bond enthalpy.

Asked in: AP EAMCET 2021 (24 Aug Shift 1)

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