Which of the following is used for writing on glass?

Correct option is C

The correct answer is (c) Hydrogen fluoride

Explanation:
• Hydrogen fluoride (HF) is used for writing on glass because it reacts with silica (SiO₂), which is the main component of glass.
• When hydrogen fluoride comes in contact with glass, it forms silicon tetrafluoride (SiF₄), a compound that etches the surface of the glass, making it suitable for marking or writing.
• This property is used in the process of glass etching.

Information Booster:
• Hydrogen fluoride is a corrosive substance and must be handled with care due to its reactive nature.
• It is commonly used in glass industries for etching designs and writing on glassware.

Additional Knowledge:
Silicon 
• Silicon is a chemical element commonly used in electronics and computer chips, but it is not used for writing on glass.

Graphite 
• Graphite is used for writing, such as in pencils, but it is not used for writing on glass.

Hydrogen iodide 
• Hydrogen iodide (HI) is a chemical compound used in various industrial processes but not for writing on glass.