Which one of the following is a chemical change ?

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Q: 68 (NDA-II/2017)

Which one of the following is a chemical change ?

question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,5,8,2,5,5,1

keywords: 

{'chemical change': [0, 0, 3, 7], 'hair': [5, 1, 2, 7], 'resin': [1, 0, 0, 0], 'graying': [0, 0, 0, 1], 'fruit': [2, 0, 0, 2], 'water': [65, 15, 80, 129]}