Which one of the following is an oxidation reduction reaction?

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Q: 54 (NDA-II/2018)

Which one of the following is an oxidation reduction reaction?
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question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,1,7,3,2,1,2

keywords: 

{'oxidation reduction reaction': [0, 0, 0, 1], 'bacl2': [0, 0, 0, 1], 'cao': [0, 0, 0, 3], 'naoh': [0, 0, 1, 9], 'h2o': [0, 0, 2, 3], 'baso4': [0, 0, 0, 1]}