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

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

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Chemical Engineering Thermodynamics
The necessary condition for phase equilibrium in a multiphase system of N components is that the

Chemical potentials of a given component should be equal in all phases
Chemical potentials of all components should be same in a particular phase
Sum of the chemical potentials of any given component in all the phases should be the same
None of these

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