Physical and Chemical Changes — Science STD 7 — Question
Gujarat BoardEnglish MediumSTD 7SciencePhysical and Chemical Changes1 Mark
MCQ
Which of the following is a chemical change:
A
melting of ice
B
Boiling of water
✓
Rusting of iron
D
Tearing a paper
✓
Answer
Correct option: C.
Rusting of iron
When iron comes in contact with air and moisture it reacts with it and forms a brownish layer on its surface due to the formation of its oxides.
This is called rusting of iron. It is a chemical change since the new substance is formed.
Melting of ice, boiling of water, and tearing of paper are all physical changes.
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