Which balanced equation represents a redox reaction? a. AgNO3 (aq) + NaCl (aq) →AgCl (s) + NaNO3 (aq) b. H2CO3 (aq) →H2O () + CO2 (g) c. NaOH (aq) + HCl (aq) →NaCl (aq) + H2O () d. Mg (s) + 2HCl (aq) →MgCl2 (aq) + H2 (g)

Can you also explain why for every answer

When we say redox reaction, the total number of electrons lost is equal to the total number of electrons gained. Redox is a combination of the Oxidation which refers to the loss of electrons from a substance and Reduction is the gain of electrons by the substance. So I think the balanced equation is letter b. The answer is H2CO3 - > H2O + CO2