Chemical Engineering Thermodynamics
At the critical point of a substance

Liquid and vapour have the same density
The surface tension vanishes
All of these
There is no distinction between liquid and vapour phases

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Chemical Engineering Thermodynamics
The second law of thermodynamics states that

The energy change of a system undergoing any reversible process is zero
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

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