From the unbalanced equations below, identify the one that does not represent a redox reaction.
a. h2co3(aq) → co2(g) + h2o(l)
b. c(s) + h2o(g) → co(g) + h2(g)
c. s2o32- (aq) + i2(s) → s4o62+ (aq) + i-(aq)
d. febr2(aq) + br2(l) → febr3(aq) reset selection