Question

Which of the following reactions are redox reactions?

a. H2CO3(aq) + 2NH3(aq) → 2NH4+(aq) + CO32-(aq)
b. 2Mg(s) + O2(g) + 2H2O(l) → 2Mg2+(aq) + 4OH-(aq)
c. Zn(NO3)2(aq) + 2NaOH(aq) → Zn(OH)2(s) + 2NaNO3(aq)
d. 2H2O(l) + 2Cl-(aq) → H2(g) + Cl2(g) + 2OH-(aq)

Answer 1

The correct answer is b. 2Mg(s) + O2(g) + 2H2O(l) → 2Mg2+(aq) + 4OH-(aq)

Step-by-step explanation:

The Mg is oxidized to Mg 2+, and the oxygen (02) is reduced.