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Which of the following is a chemical change?

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
NCERT Solutions for Class 11 Chemistry Select the correct answer from above options 
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