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A student is asked to draw the college building on a piece of glass. He would use:
(A) Hydrochloric acid
(B) Hydrofluoric acid
(C) Hydrobromic acid
(D) Hydroiodic acid
HF dissolves glass
SiO2 + 4HF ----> SiF4 + 2H2O
SiF4 + 2HF -----> H2SuF6
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