Q1: Glass reacts with

ANS:B - HF

Glass is primarily composed of silicon dioxide (SiO2) and is generally resistant to chemical reactions with most common acids and bases. However, it can react with certain strong acids or bases under specific conditions. Among the options provided:

• H2SO3 (sulfurous acid): Generally, glass is resistant to sulfurous acid.
• HNO3 (nitric acid): Nitric acid is a strong oxidizing acid and can react with glass, especially at elevated temperatures and concentrations.
• HF (hydrofluoric acid): Hydrofluoric acid is one of the few acids that can attack glass, as it reacts with the silicon dioxide in glass to form silicon tetrafluoride (SiF4) and water.
• K2Cr2O7 (potassium dichromate): Generally, glass is resistant to potassium dichromate.