Question

How would you consider a chemical reaction as a redox chemical equation if there is no hydrogen and oxygen is present?

Answer 1

It is not neccessary that a redox reaction has H2

A redox reaction is one in which transfer of electrons takes place

redox ----> reduction + oxidation

oxidation ----> loss of e-   } OIL (Oxidation is loss)

reduction ---> gain of e-   } RIG (Reduction is gain)

So it is not neccesary for H2 to be present if there is gain and loss of e- it is redox reaction