Question

What is the reaction called when oxidation and reduction take place simultaneously explain with one example

Answer 1

in the reaction when oxygen is added the the reaction called oxidation and when hydrogen is added then reaction called reduction eg.
2Ca+O2 gives 2cao and 2H2+O2 gives 2H2o

Answer 2

Reaction is known as Redox reaction...
E.g:Fe2O3(s) + 2Al(s) → Al2O3(s) + 2Fe(l)
(here Fe gets reduced and Al gets oxidised)