In which of the following changes, entropy of the system decreases?

Step-by-step solution

Entropy is a measure of the randomness or disorder of a system. For the dissolution of solid I ₂ in water, a solid changes into an aqueous solution, which increases the randomness. Thus, entropy increases ( S > 0 ). For the dissociation of H ₂ molecules into atoms, H ₂(g) 2 H (g) , the number of gaseous particles increases. Thus, entropy increases ( S > 0 ). For the formation of liquid water from hydrogen and oxygen gas molecules, 2 H ₂(g) + O ₂(g) 2 H ₂ O (l) , gaseous reactants are converted into a liquid product