Question

On dissolving $NaCl$ in water there occurs a/an:

• A. increase in free energy
• B. increase in entropy
• C. decrease in entropy
• D. no change in entropy

Answer 1

The correct option is B increase in entropy

On dissolving $NaCl$ in water, the lattice breaks and the ions are formed which are hydrated by the water molecules. Due to the breaking of the lattice into ions, the disorderness increases. Hence, the entropy increases.
Entropy increases everytime a solute dissolves in a solvent.