Which one can be directly solidified from gaseous state without entering into liquid state ?
Correct answer: C. Carbon dioxide
- A. Helium
- B. Oxygen
- C. Carbon dioxide
- D. None of these
Explanation
Carbon dioxide can pass directly from vapour to solid as dry ice by deposition, without a liquid phase at pressures below its triple-point pressure. This is why CO2 snow forms from compressed gas under suitable conditions.
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