Which of the following is a double replacement reaction?

a. 2SO2 + O2 - > 2S03

b. Zn + Cu (NO3) 2 → Zn (NO3) 2 + Cu

c. 2H2O2-> 2H2O + O2

d. AgNO3 + NaCl → AgCl + NaNO3

The answer to your question is: letter D.

Explanation:

Double replacement reaction is when the cation of one reactant replaces the metal of the other reactant and vice versa.

a. 2SO2 + O2 - > 2S03 This is a combination reaction

b. Zn + Cu (NO3) 2 → Zn (NO3) 2 + Cu This is a single replacement reaction.

c. 2H2O2-> 2H2O + O2 This is a decomposition reaction

d. AgNO3 + NaCl → AgCl + NaNO3 This is a double replacement reaction