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Which of the following is a chemical change?

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in Chemistry – Class 11 by (148k points)
Which of the following is a chemical change?

(a) Conversion of water to ice

(b) Rusting of iron

(c) Crumpling a sheet of aluminum foil

(d) Casting silver

I have been asked this question in semester exam.

Enquiry is from Importance of Chemistry in division Chemistry Basic Concepts of Chemistry – Class 11

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The correct choice is (b) Rusting of iron

Explanation: In rusting of iron, the oxidation state of iron changes, but in the conversion of water to ice, crumpling a sheet of aluminum foil and casting silver the chemical state remains same whereas the physical state changes. When iron is exposed to oxygen, iron oxide formation takes place.

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