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Name the process associated with the following. Dry ice is kept at room temperature and at one atmospheric pressure.

1. Evaporation
2. Sublimation
3. condensation
4. Liquefaction

Correct answer: Sublimation

Solution

Dry ice is solid carbon dioxide. At 1 atm and room temperature, solid CO2 changes directly from solid to gas, which is called sublimation. It does not pass through the liquid state under these conditions.

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