Which one of the following is not an example a redox reaction A.Rusting nail B.Burning wood C.Browning apple core D.Mixing baking soda and vinegar?

The correct answer is D. Rusting nail, burning wood, and browning apple core are all examples of redox reactions.

- Rusting nail involves the oxidation of iron (Fe) to iron oxide (Fe2O3).

- Burning wood involves the oxidation of carbon (C) to carbon dioxide (CO2).

- Browning apple core involves the oxidation of polyphenols in the apple core to form brown pigments.

On the other hand, mixing baking soda (NaHCO3) and vinegar (CH3COOH) results in a neutralization reaction, not a redox reaction. In a neutralization reaction, an acid and a base react to form a salt and water. In this case, the products are sodium acetate (CH3COONa) and water (H2O).