Redox Reaction Identification in MgSO4 Preparations

Steps:

• Recall redox reactions involve electron transfer, shown by changes in oxidation states.
• Examine each option for oxidation state changes in reactants and products.
• Identify reactions where elements gain and lose electrons (reduction and oxidation).
• Confirm the reaction with both processes as the redox example.

Why A is correct:

• In Mg (0) + H₂SO₄ → MgSO₄ + H₂, Mg oxidizes from 0 to +2 (loses electrons), and H in H₂SO₄ reduces from +1 to 0 (gains electrons), fitting the redox definition.

Why the others are wrong:

• B: Acid-base neutralization; no oxidation state changes, just proton transfer.
• C: Acid-carbonate reaction; decomposes to release CO₂, no electron transfer.
• D: Acid-base neutralization; oxide reacts with acid to form salt and water, no redox.

Final answer: A