redox reaction

[inaccensa]

3NO2+H2O-->2HNO3+NO

I can see oxidation number of N changing NO2-->+4, HNO3-->+5, NO-->+2, how do i determine whether it is undergoing reduction or oxidation? how is this a redox reaction?

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[FutureDoctor503]

Oxidation and reduction occur at the same time. Hence, it's called a redox reaction (red for reduction, ox for oxidation).

Oxidation - NO2 to HNO3 - +4 to +5 (an electron is removed)
Reduction - NO2 to NO - +4 to +2 (electrons are added)

 

[inaccensa]

Oxidation and reduction occur at the same time. Hence, it's called a redox reaction (red for reduction, ox for oxidation).

Oxidation - NO2 to HNO3 - +4 to +5 (an electron is removed)
Reduction - NO2 to NO - +4 to +2 (electrons are added)

Oh yeah, i got that its called disproportionation reaction when the same element is both oxidized and reduced in one of the following questions. Thanks for the reply..