Chemical Engineering Thermodynamics
The second law of thermodynamics states that

The total energy of system and surrounding remains the same
It is not possible to transfer heat from a lower temperature to a higher temperature
None of these
The energy change of a system undergoing any reversible process is zero

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

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

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