Consider the reaction:
Ba^2+ (aq) + 2OH^- (aq) → Ba(OH)2 (s)
This reaction is NOT considered a redox reaction because:
a) It only results in the formation of one product
b) It only involves the oxidation of barium
c) the oxidation number of the element does not change
d) the product is in the solid state
e) it only involves the reduction of barium
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