For 'etching glass' the acid that is used among the following ones is

Options :
  1. Bromic acid
  2. Hydrofluoric acid
  3. Perchloric acid
  4. Periodic acid
Answer and Explanation :-

Answer: Option 2

Explanation:

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Somewhere fate laughs in her far-off country, because now I am the human and it is Grace I will lose again and again, immer wieder, always the same, every winter, losing more of her each year, unless I find a cure.
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