Chemical Engineering Thermodynamics
Third law of thermodynamics is helpful in

Both B and C
Calculating absolute entropies of substances at different temperature
Evaluating entropy changes of chemical reaction
Prediction of the extent of a chemical reaction

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

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