Question

Which equation represents an oxidation-reduction reaction?
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Answer 1

CH₄ + 2O₂ → CO₂ + 2H₂O is the equation that represents an oxidation-reduction reaction.

• An oxidation-reduction reaction is called the redox reaction.
• Redox reaction is a type of chemical reaction that involves a transfer of electrons between two species in turn the oxidation states of atoms are changed.  

• In the above reaction, 1 C atom is oxidised from -4 to 4 while 4 O atoms are reduced from 0 to -2.
• Hence the above reaction represents an oxidation-reduction reaction.