Chemical Engineering Thermodynamics
The second law of thermodynamics states that

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

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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 different for different gases
The inversion temperature is same for all gases
The inversion temperature is the temperature at which Joule-Thomson co-efficient is infinity

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