Which one of the following is not a chemical change?(a) formation of curd (b) ripening of banana(c) sublimation of naphthalene (d) corrosion of photo frame

Correct Answer: (c) sublimation of naphthalene

Explanation: Sublimation of naphthalene is not a chemical change as naphthalene only changes its state from solid to vapour. No new substance is formed and the vapour can again be condensed to solid form.