Question

how can we identify oxidation or reduction reaction is taking place

Answer 1

Addition of oxygen and removal of hydrogen is called oxidation and addition of hydrogen and removal of oxygen is called reduction. So whenever we found this situation we can easily identify oxidation and reduction reaction.

Answer 2

WHEN THERE IS REACTION BETWEEN ANY SUBSTANCE AND THERE IS ADDITION OF OXYGEN THEN IT IS CALLED OXIDATION REACTION
AND WHEN THERE IS REACTION BETWEEN TWO SUBSTANCES AND WHEN OXYGEN IS REMOVED OR HYDROGEN IS ADDED THIS TYPE OF REACTION IS CALLED REDUCTION REACTION
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