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Per NCERT, what is the difference between a PHYSICAL and a CHEMICAL change?
AThere is no difference
BPhysical: only shape, size, or state changes — no new substance is formed (e.g. melting ice). Chemical: a new substance is formed with different properties (e.g. burning paper)
CPhysical changes are slow; chemical changes are fast
DPhysical changes need heat; chemical changes need cold
Answer & Solution
Correct answer: B. Physical: only shape, size, or state changes — no new substance is formed (e.g. melting ice). Chemical: a new substance is formed with different properties (e.g. burning paper)
Per NCERT §9 Activity 9.1 + 9.2, physical change → same substance + different form; chemical change → new substance formed.
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