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(C) In a reaction where the oxidation number does not change,it is a non-redox reaction (e.g.,acid-base neutralization).In reaction $C$,$Na_2O + H_2SO

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$Na_2O + H_2SO_4 	o Na_2SO_4 + H_2O$

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(C) In a reaction where the oxidation number does not change,it is a non-redox reaction (e.g.,acid-base neutralization).In reaction $C$,$Na_2O + H_2SO_4 	o Na_2SO_4 + H_2O$:Oxidation states of $Na$ is $+1$,$O$ is $-2$,$H$ is $+1$,and $S$ is $+6$ on both sides.Since there is no change in the oxidation state of any element,this is not a redox reaction.

In which of the following reactions does the oxidation number not change?

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