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
Ice at the base contains impurities which lowers its melting point
Due to the high pressure at the base, its melting point reduces

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Chemical Engineering Thermodynamics
Critical solution temperature (or the con-solute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which

Mutual solubility of the two liquids shows a decreasing trend
A homogeneous solution (say of phenol water) is formed
Two liquids are completely separated into two layers
None of these

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