Question

In this reaction :-

H2 + O2 = 2H2O

HYDROGEN undergoes oxidation and the OXYGEN undergoes reduction...

Now, in this reaction :-

C + O2 ----- CO2

when oxygen is added to carbon then carbon undergoes oxidation reaction

But if we see oxygen there what does the reaction oxygen undergoes?

Reduction or oxidation?

Please give the required answer if you know..
Thanks!

Answer 1

Hola there,

Reaction => C + O2 –› CO2

Let me first explain oxidation and reduction according to Modern Concept (electronic concept)

Oxidation : Loss of electron from an element or increase in positive electrovalency of an element is called as oxidation.

Reduction : Gain of electron by an element or increase in negative electrovalency of an element is called reduction.

Now, In the given reaction element C is oxidised from 0 to +2 oxidation state. And O2 is being reduced from +4 to +2 oxidation state.

So, O2 is undergoing reduction.
and C is undergoing oxidation
Hence the given redox reaction.

Hope understood...:)
If not then let me know..

Answer 2

In that case oxygen is undergoing reduction. As we know the element which get oxidized is a reducing agent and the substance which get reduced is an oxidizing agent. So, if we take the reaction of
C+O2= CO2
Here, C is a oxidized , so it  is a reducing agent
 and O2 is oxidizing agent , so it is reduced.

Hope, it will help you...and it is easiest way for me to make you understand this