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

answer; i believe the correct answer is (solid gold);