Chemical Engineering Thermodynamics
For an exothremic reaction

Only internal energy change (ΔE) is negative
Enthalpy change is zero
Only enthalpy change (ΔH) is negative
Both ΔH and ΔE are negative

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

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
The iceberg remains in a warmer condition at the base

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