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chemistry doubt!

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Ghost Of Highbury:
okk..a doubt in reduction and oxidation

1) C4H8 + 6O2 --> 4CO2   +   4H2O

is this reduction, oxidation or reduction and why?

i strongly think that it is oxidation as oxygen is added...however, the oxidation state of "oxygen" decreases from -4 to -6

so its redox...
plzz..helpp!!

2.) 2KNO3=2KNO2+O2
      
   this equation is so messed up for oxidation states


    there are three elements in 1 compund ...how do u determine the oxidation states for them

plzz help!! is it oxidation reduction or redox..(plz explain the reason too!


thanks a lot!!
    

astarmathsandphysics:
It is oxidation cos oxygen goes from the pure state to a compound.

astarmathsandphysics:
The 2nd is reduction cos oxygen returns to the pure state.

Ghost Of Highbury:
but...do v take the oxidation stte of oxygen in both the reactions...

if so...the oxidation state decreases and thus the 1st one becomes redox right?

also, can u explain the second reaction with the oxidation states...

thanks !

Ghost Of Highbury:
nid404 plz answer

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