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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)rarr CaO + CO_(2)`
B. `O_(2)+2H_(2) rarr 2H_(2)O`
C. `Na+H_(2)O rarr NaOH +(1)/(2)H_(2)`
D. `MnCl_(3) rarr MnCl_(2)+(1)/(2)Cl_(2)`
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Correct Answer - A
Only the reaction in which O.N of elements changes in a redox reaction.
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