Identify the processes in which the entropy of the system decreases. A. Freezing of water to ice at 273 K . B. 2 SO _ 2( g ) + O _ 2( g ) 2 SO _ 3( g ) C. Mixing of two non-reacting ideal gases at constant temperature. D. Dissolution of oxygen gas in water. Choose the correct answer from the options given below:

Step-by-step solution

A. Freezing of water to ice at 273 K : The process involves the conversion of a liquid to a solid. The molecules become more ordered, so the entropy of the system decreases ( S B. 2 SO _ 2( g ) + O _ 2( g ) 2 SO _ 3( g ) : The number of moles of gaseous species decreases from 3 to 2 . This leads to a decrease in randomness, so the entropy decreases ( S C. Mixing of two non-reacting ideal gases at constant temperature: The volume available for each gas increases, leading to an increase in randomness. Thus, the entro