Which series of reactions correctly represents chemical rections related to iron and its compounds ?

Options

A. `Fe overset(dil. H_2SO_4)to FeSO_4 overset(H_2SO_4, O_2)to Fe_2(SO_4)_3 overset("heat")to Fe`
B. `Fe overset(O_2,"heat")to FeO overset(dil. H_2SO_4)to FeSO_4 overset("heat")toFe`
C. `Feoverset(Cl_2, heat)to FeCl_3 overset(heat, air")toFeCl_2 overset(Zn)toFe`
D. `Fe overset(O_2, heat)to Fe_3 O_4 overset(CO, 600^@C) to FeO overset(CO, 700^@C) to Fe`

Answer

D

Explanation

The correct reaction are as follows
(a) `Fe + H_2SO_4 to FeSO_4 + H_2, H_2 SO_4 + 2FeSO_4 + 1/2O_2 to Fe_2(SO_4)_3 + H_2O`
`Fe_2(SO_4)_3 overset(Delta) to Fe_2O_3 (s) + 3SO_3uarr` (This is given wrongly)
(b) `Fe underset(Delta)overset(O_2) to FeO` (it could also be `Fe_2O_3 or Fe_3O_4`)
`FeO + H_2 SO_4 to FeSO_4 + H_2O`
`2FeSO_4 overset(Delta)to Fe_2O_3 + SO_2 + SO_3`
(c) `Fe underset(Cl_2)overset(Delta)to FeCl_3 underset(air)overset(Delta)to` no reaction (it cannot give `FeCl_2`)
(d) `Fe underset(Delta) overset(O_2) to Fe_3 O_4 underset(600^@C) overset(CO) to FeO underset(700^@C) overset(CO) to Fe`
The is correct.