Question

what are redox reactions?

Answer 1

An oxidation-reduction or redox reaction is a chemical reaction in which an exchange of electrons occurs. The chemical species that picks up electrons is called "oxidant"; The one that yields them, "reducer".

Redox reactions are a large family comprising many chemical reactions, as they are involved in combustion, metallurgical metals, metal corrosion, electro-chemistry or cellular respiration. These reactions in particular play a fundamental role in biology, in the transformation of oxygen within living bodies. They are also heavily used by human industry, such as obtaining iron from iron ore ores by reduction and then iron and steel from cast iron, oxidation.


This variety is explained by the mobility of the electron, its lightness and its omnipresence in all forms of matter.

Answer 2

redox reaction :- the reaction , both oxidation and reduction ocurr simultaneously .


example :-
Zn + H2SO4 → ZnSO4 + H2(↑)

first step 1 :- Zn loss electrons becoz this is metal .
Zn → Zn+2 +2e -----(1)
we now , loss of electrons , is known as oxidation . so, eqn (1) is oxidation .

step 2:-
H2SO4 break into two opposite pole ions .e.g
H2SO4 → 2H+ + SO4-2

step 3 :-
2H+ take two electrons then form H2 gas e.g
2H+ +2e → H2 (↑)
we know, accept of electrons is known as reduction , so, above equation is reduction reaction .

step 4 : - now, Zn+2 and SO4-2 add to form ZnSO4

here this is clear that oxidation and reduction both occur simultaneously so, this reaction is a redox reaction