Acetylene (C₂H₂) is unstable under high pressure and can decompose explosively if compressed to a liquid in a plain cylinder. For safety, acetylene is stored dissolved in acetone (or similar solvent) within porous material inside cylinders to prevent liquefaction and explosive decomposition. Oxygen, nitrogen, and helium do not exhibit this hazardous behaviour when compressed to liquid under normal storage practices.
Which of the following gas explodes on compression to a liquid?
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