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Select all the correct answers. Which chemical equations show an oxidation-reduction reaction?

a) O₂ + 2H₂ → 2H₂O
b) MgSO₄ + CaCl₂ → MgCl₂ + CaSO₄
c) 2Al + 6H₂ → 2AlI₃ + 3H₂
d) FeCl₂ + Na₂CO₃ → FeCO₃ + 2NaCl + 2AgNO₃ + Na₂S → Ag₂S + 2NaNO₃

1 Answer

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Final answer:

The chemical equations that depict an oxidation-reduction reaction are generally characterized by the change in oxidation states of elements. The valid equation for an oxidation-reduction reaction is (a), which shows the reaction between oxygen and hydrogen to form water.

Step-by-step explanation:

The chemical equations that show an oxidation-reduction reaction are those in which the oxidation state of elements changes from the reactant side to the product side. These reactions involve a transfer of electrons between substances, where one substance gains electrons (reduction) and another loses electrons (oxidation). (a) O₂ + 2H₂ → 2H₂O - This is an oxidation-reduction reaction because hydrogen is being oxidized and oxygen is being reduced. (c) 2Al + 6H₂ → 2AlI₃ + 3H₂ - The reaction listed contains a typo and thus cannot be accurately assessed for being an oxidation-reduction reaction.

Other given chemical equations either do not show changes in oxidation states or are not complete or correct representations for oxidation-reduction reactions. For example, equation (c) seems to contain typos and is not a valid chemical equation. Part (b) represents a double displacement reaction, not an oxidation-reduction reaction. The unlisted equation involving Silver (Ag), based on the oxidation state change during the reaction, would indicate an oxidation-reduction process. So, the valid equation for an oxidation-reduction reaction is (a), which shows the reaction between oxygen and hydrogen to form water.

User Sid Holland
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