Why hydrogen bromide dissolves glass?
Please note it is Hydrogen fluoride which is capable of dissolving glass not HBr.
For reason please refer to the following link:
https://www.meritnation.com/ask-answer/question/hydrofluoric-acid-is-used-for-etching-of-glass-why/the-p-block-elements/7005750
Moreover aquaregia is a mixture of HNO3 and HCl in 1:3 ratio.
This is not a part of your syllabus and it will be taught in higher class
For reason please refer to the following link:
https://www.meritnation.com/ask-answer/question/hydrofluoric-acid-is-used-for-etching-of-glass-why/the-p-block-elements/7005750
Moreover aquaregia is a mixture of HNO3 and HCl in 1:3 ratio.
This is not a part of your syllabus and it will be taught in higher class