Why glass is chemically inert?

Answer 1

Glass is Silicon Dioxide (SiO2)

Silicon is unreactive chemically because an oxide layer seals the surface from attack, and high temperatures are required for oxidation to occur. Silicon does, however, react with fluorine at room temperature. It is not attacked by aqueous acids, but does react with concentrated alkalis.

Source: Google

Answer 2

The dense Si-O network make it very resistant. However, HF will attack it and in fact is the etching agent used.

Answer 3

No, it's generally unreactive, which is why we can store many substances safely in it.

Answer 4

No.