Final answer:
The reaction 2Na + 2H₂O -> 2NaOH + H₂ does not involve oxidation-reduction, unlike the other options.
Step-by-step explanation:
The reaction 2Na + 2H₂O -> 2NaOH + H₂ does not involve oxidation-reduction. In an oxidation-reduction reaction, there is a transfer of electrons between reactants, resulting in a change in oxidation states. However, in this reaction, sodium (Na) is not changing its oxidation state because it is already in the +1 oxidation state in both reactants and products. Similarly, hydrogen (H₂) is not changing its oxidation state. Therefore, this reaction is not an oxidation-reduction reaction.
On the other hand, the other options provided are all oxidation-reduction reactions. For example, the reaction 2K(s) + Br₂(l) -> 2KBr(s) involves the transfer of electrons from potassium (K) to bromine (Br₂), resulting in the formation of potassium bromide (KBr). Each potassium atom loses one electron and is oxidized, while each bromine molecule gains one electron and is reduced.
In summary, the answer is C) 2Na + 2H₂O -> 2NaOH + H₂. This reaction does not involve oxidation-reduction, unlike the other options.