Can a combination reaction be a redox reaction? Give an example in support of your answer.
Yes, a combination reaction can be a redox reaction too.
Combination reaction: The reaction in which two or more two reactants combine together to form a single product is called a combination reaction.
Redox reaction: The reaction in which the reduction and oxidation process takes place simultaneously is called the redox reaction.
Oxidation: The addition of oxygen or removal of hydrogen is called oxidation.
In other terms, the loss of electrons is called oxidation.
Reduction: The addition of hydrogen or removal of oxygen is called reduction.
In other terms, the gain of electrons is called reduction.
For example: When a carbon combines with oxygen to form carbon dioxide this reaction is a combination reaction as carbon(C) is combined with oxygen(O) to form carbon dioxide()
Here carbon is combining with oxygen so oxidation of carbon is taking place while oxygen is combining with carbon which is less electronegative to it that's why reduction of oxygen is taking place.
On the reactant side:
Oxidation state of carbon(C) : 0
Oxidation state of oxygen() : 0
On the product side:
The oxidation state of carbon(C) : (+4)
The oxidation state of oxygen() : (-2) of each oxygen
So, as we can observe the carbon got oxidized and oxygen is got reduced, and the reaction will be a Redox reaction.