Question

Glass can be etched or scratched by which of the following materials?

(1) Diamond (2) Hydrofluoric acid

(3) Aquaregia (4) conc. Sulphuric acid

Code:

• A. 1, 3 and 4
• B. 2 and 3
• C. 1 and 2
• D. 2 and 4

Answer 1

The correct option is C

1 and 2

(C)