NEET Chemistry: Chemical Reactions and Equations questions with solutions

Q1. Which of the following statements is not correct?

1. In a chemical change, color of the object may change.
2. In a chemical change, heat will always be released.
3. A chemical change always involves a physical change.
4. Rusting of iron becomes faster when humidity is high.

Answer: In a chemical change, heat will always be released.

The incorrect statement is the one claiming heat is always released, because chemical changes can be exothermic or endothermic. The other statements describe common effects or conditions of chemical change, including rusting being faster in humid air.