Heat Transfer
In case of a supercooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is

Less
More
More or less; depends on the nature of solution
Same

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Heat Transfer
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is

Shell and tube heat exchanger with air on shell side and steam inside tubes
Finned tube heat exchanger with air outside and steam inside
Shell and tube heat exchanger with air inside tubes and steam on shell side
Finned tube heat exchanger with air inside and steam outside

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