List observations when iron is dipped in dilute sulphuric acid.

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)

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