When iron is dipped in dilute sulphuric acid it reacts in two forms
The general chemical reaction occurs as given below
Fe(s) + H2SO4(aq) → Fe2+(aq) + SO42-(aq) + H2(g)
(i) In the presence of oxygen
It forms solutions containing Fe(II) ion along with hydrogen gas
(ii) In the absence of oxygen
The Fe(II) present in the solution oxidizes to Fe(III)