Question

What is reduced in the reaction below?

Answer 1

Answer:

${ \underline{ \sf{O _{2} \: is \: reduced}}}$

Explanation:

Reduction means when a reactant loses oxygen or gains hydrogen.

In the equation:

Hydrogen molecule, it neither gains nor loses hydrogen, but it gains oxygen. so :

${ \sf{H _{2} \: is \: excluded}}$

Oxygen molecule loses one oxygen atom, and gains four hydrogen atoms, hence it is reduced.