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In which reaction does the oxidation number of oxygen increase?

a. Ba(NO3)2+K2SO4--->BASO4+2KNO3
b. HCL+ NaOH---> NaCl+H20
c. Mg0+ H20---> Mg(OH)2
d. 2SO2+02---> 2SO3
e. 2H2O---> 2H2+O2

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