Question

Consider the following reaction.

CO2(g)+H2(g) --------> CO(g)+H2O(I)

What is being oxidized?

A carbon
B carbon dioxide
C oxygen
D hydrogen

Answer 1

Try looking at the oxidation numbers of each component and how they change in the reaction. 
Oxidation of Oxygen will always stay -2 (unless it is bonded to fluorine) 
The overall oxidation number of the compund/ molecule must add up to 0.

                              Oxy no. in reactants             Oxy no. in products     red/oxy   
Components: 
Carbon                               +4                                              +2               Reduced
Oxygen                               -2                                              -2              Unchanged
Hydrogen                            0                                               +1               Oxidised
 
Therefore, since the oxidation number  of the Hydroden increased, Hydrogen has been oxidised.

Answer 2

In the given reaction Hydrogen is getting oxidised Hence , Option (D) is the correct option.

What is Oxidation reaction ?

Oxidation reaction is a chemical reaction in which oxygen is added to or hydrogen is removed from an element, molecule or a compound.

Now, In the given reaction, It is simply observed that Hydrogen from the reactant side got converted in to H₂O (Water) at the product side.

It means, Hydrogen got oxidised as oxygen got added with Hydrogen

Hence ,  In the given reaction Hydrogen is getting oxidised Thus , Option (D) is the correct option.

Learn more about oxidation here ;

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