Which one of the following reactions is ...

Which one of the following reactions is not a redox reaction ?

A

`2NaNO_(3) rarr 2NaNO_(2) + O_(2)`

B

`KCl + NaNO_(3) rarr KNO_(3) + NaCl`

C

`Fe + H_(2)SO_(4) rarr FeSO_(4) + H_(2)`

D

`4Ag + 8CN^(-) + O_(2) + H_(2)O rarr 4[Ag(CN)_(2)]^(-) + 4OH^(-)`

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The correct Answer is:

B

Oxidation state of all species remain unchanged so it is not redox

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