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)
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