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Which of the following is not a redox reaction?

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Which of the following is not a redox reaction?
A. `CaCO_(3)rarrCaO+CO_(2)`
B. `O_(2)+2H_(2)rarr2H_(2)O`
C. `Na+H_(2)OrarrNaOH+1//2H_(2)`
D. `MnCI_(3)rarr?MnCI_(2)+1//2CI_(2)`
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`(overset(+2)Ca overset(-2)O_(3))^(+4)rarroverset(+2)Caoverset(-2)O+overset(+2)Coooverset(-2)O_(2)`
This is not a redo reaction because no element undergoeso changes in oxidation number
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