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Question

Science Question on Redox reactions

Which of the following is a redox reaction, but not a combination reaction?

A

C + O₂ → CO₂

B

H₂ + O₂ → H₂O

C

Mg + O₂ → MgO

D

Fe₂O₃ + 3 CO → 2 Fe + 3 CO₂

Answer

Fe₂O₃ + 3 CO → 2 Fe + 3 CO₂

Explanation

Solution

Fe₂O₃ + 3 CO → 2 Fe + 3 CO₂ involves both oxidation (CO → CO₂) and reduction (Fe³⁺ → Fe), but it is not a combination reaction since multiple products are formed.