Chemistry
Grade-6
Easy
Question
When liquid CO2 is cooled to –78.5 °C, it changes into a snow-white solid, which is called
- Dry CO2
- Dry solid
- Dry ice
- Snow ice
Hint:
The use of solid carbon dioxide may help us in remembering and understanding it better. It is also used as a cooling agent, used to preserve food for a long time, etc.
The correct answer is: Dry ice
When liquid CO2 is cooled to –78.5 °C, it changes into a snow-white solid, which is called Dry ice.
Dry ice sublime at -78 degree celsius that is in terms of kelvin is 194.65K in earth's atmosphere pressure. Sublimes means, on heating, it does not change to liquid but instead directly converted to gas. This is the reason why solid carbon dioxide is called dry ice.
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