Chemical Engineering Thermodynamics
In Joule-Thomson porous plug experiment, the

Enthalpy does not remain constant
Entire apparatus is exposed to surroundings
Temperature remains constant
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

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

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