Chemical Engineering Thermodynamics
Choose the condition that must be specified in order to liquify CO₂ (triple point for CO₂ is - 57°C and 5.2 atm).

Pressure must be kept below 5.2 atm. and temperature must be kept above 57°C
Pressure and temperature must be kept below 5.2 atm. and - 57°C respectively
Pressure must be kept below 5.2 atm
Temperature must be kept above - 57°C

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Chemical Engineering Thermodynamics
Which one is true for a throttling process?

The inversion temperature is different for different gases
The inversion temperature is same for all gases
A gas may have more than one inversion temperatures
The inversion temperature is the temperature at which Joule-Thomson co-efficient is infinity

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