Which of the following is an oxidation-reduction reaction?
SO2(g) + H2O(l) mc010-1.jpg H2SO3(aq)
CaCO3(s) mc010-2.jpg CaO(s) + CO2(g)
Ca(OH)2(s) + H2CO3(l) mc010-3.jpg CaCO3(aq) + 2H2O(l)
C6H12O6(s) + 6O2(g) mc010-4.jpg 6CO2(g) + 6H2O(l)