Question Detail
Question
All of the options below are examples of physical changes except?
Correct Answer
Option C is the correct answer.
Detailed Explanation
Adsorption is a surface phenomenon, but it often involves chemical bonds (chemisorption) or is a change in chemical environment. It is generally considered a physical change only if purely physisorption. However, compared to the others (which are clearly physical), adsorption is the least obviously a purely physical change and is often treated in chemistry contexts as a surface chemical process.
Hint
Physical changes alter form but not chemical identity.