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WhicWhich of the following is an oxidation-reduction reaction?
SO2(g) + H2O(l) mc010-1.jpg H2SO3(aq)
CaCO3(s) mc010-2.jpg CaO(s) + CO2(g)
Ca(OH)2(s) + H2CO3(l) mc010-3.jpg CaCO3(aq) + 2H2O(l)
C6H12O6(s) + 6O2(g) mc010-4.jpg 6CO2(g) + 6H2O(l)h of the following is an oxidation-reduction reaction?

Answer :

I believe the correct answer is the last one. The reaction C6H12O6(s) + 6O2(g) = 6CO2(g) + 6H2O(l) is the oxidation-reduction reaction. Assigning oxidation states, we will see that the oxidation of O would reduce from 0 to -2 and C would be oxidized from 0 to +4.
Dejanras

Answer is: C6H12O6(s) + 6O2(g) → 6CO2(g) + 6H2O(l).

Balanced chemical reaction for cellular respiration (convert biochemical energy):  

C₆H₁₂O₆(s) + 6O₂(g) → 6CO₂(g) + 6H₂O(l).

In this reaction carbon is oxidized (lost electrons) and oxygen is reduced from oxidation number 0 to oxidation number -2 (gain electrons).

In other example atoms do not change their oxidation numbers.

Glucose (C₆H₁₂O₆) is a chemical compound composed of six carbon atoms, twelve hydrogen atoms and six oxygen atoms.

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