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WBCS Preliminary Examination 2015 — General Studies · Question 108 of 200

Q108
General ScienceChemistry
The compound that can not be kept is glass vessel because it reacts with glass is
  1. a.HNO3
  2. b.HCl
  3. c.HF
  4. d.HBr

Answer: (C) HF

Hydrofluoric acid (HF) cannot be stored in glass vessels because it reacts with and corrodes silicon dioxide (SiO₂), the main constituent of glass. The reaction produces silicon tetrafluoride and water, gradually dissolving the glass. HF is therefore stored in plastic (HDPE or PTFE) containers.

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