Q: Which one of the following statements is NOT correct?
(a)Inter-conversion of states of matter is a physical change
(b)Both chemical and physical changes occur during the burning of a candle
(c)In a physical change the chemical composition of a substance changes
(d)Rusting of iron is a chemical change
Correct Answer: (c)
The correct answer is (c): In a physical change the chemical composition of a substance changes. Subject: General Science | Sub-topic: Chemistry - Acids & Bases Note: This answer was determined through AI-based research. Verify against the official answer key when available.