Explanation:

- Quartz is a mineral composed of silicon and oxygen atoms.

- Correct Answer: Option: 2 SiO2

- Quartz has the chemical formula SiO2, meaning it is composed of one silicon atom bonded to two oxygen atoms.

- Option: 1 SiO1

- This formula represents an incorrect stoichiometry for quartz. Silicon typically bonds with two oxygen atoms in its stable form.

- Option: 3 SiO3

- This option does not align with quartz's structure, as an additional oxygen would require a different configuration of the atoms, which does not occur naturally for this mineral.

- Option: 4 SiO5

- This structure is not feasible in nature for quartz, involving too many oxygen atoms for each silicon atom, leading to an unstable configuration.