Chemical Engineering Thermodynamics
Which of the following is not a reversible process ?

Atmospheric pressure vaporisation of water at 100°C
Expansion of an ideal gas against constant pressure
None of these
Solution of NaCl in water at 50°C

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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 total energy of system and surrounding remains the same
The energy change of a system undergoing any reversible process is zero
None of these

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Chemical Engineering Thermodynamics
A large iceberg melts at the base, but not at the top, because of the reason that

All of these
Due to the high pressure at the base, its melting point reduces
The iceberg remains in a warmer condition at the base
Ice at the base contains impurities which lowers its melting point

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