# In which of the following process does the entropy decrease?

$(a)\;\text{dissolving of$NaCl$in water} \\(b)\;\text {evaporation of water} \\(c)\;\text{conversion of$CO2_{(g)}$into dry ice} \\(d)\;\text{none}$

Dry ice is frozen $CO_2$ gas. The freezing temperature at normal sea level air pressure is -78.5 degrees C (-109.3 degrees F).
conversion of $CO2_{(g)}$ into dry ice is correct.
Hence c is the correct anwser.
edited Feb 19