Which one of the following is not an example of an oxidation reaction ?

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Q: 8 (CDS-I/2022)

Which one of the following is not an example of an oxidation reaction ?
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question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,125,134,30,125,52,52

keywords: 

{'oxidation reaction': [0, 0, 0, 1], 'barium chloride': [0, 0, 1, 1], 'sodium sulphate solution': [0, 0, 0, 1], 'aqueous solution': [0, 0, 4, 2], 'white substance': [0, 0, 0, 1], 'brown powder': [0, 0, 0, 1], 'butter changes': [0, 0, 0, 1], 'iron': [0, 0, 1, 1], 'wine': [1, 0, 0, 2], 'taste': [2, 0, 0, 3]}