Which of the following phase changes is exothermic for the substance undergoing the…

CHEMISTRY · Single correct · CBSE · Chemistry · Matter in Our Surroundings · Matter in Our Surroundings

Problem

Which of the following phase changes is exothermic for the substance undergoing the change at 1 atm? (a) CO2(s)→CO2(g)\text{CO}_2(s) \rightarrow \text{CO}_2(g) (sublimation) (b) H2O(g)→H2O(l)\text{H}_2\text{O}(g) \rightarrow \text{H}_2\text{O}(l) (condensation) (c) C2H5OH(l)→C2H5OH(g)\text{C}_2\text{H}_5\text{OH}(l) \rightarrow \text{C}_2\text{H}_5\text{OH}(g) (vaporization) (d) H2O(s)→H2O(l)\text{H}_2\text{O}(s) \rightarrow \text{H}_2\text{O}(l) (melting)

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