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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.

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

Solution

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.

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