How do you know how to...?
#(i)# represent the complete oxidation of iron metal to ferric oxide?
#(ii)# represent the thermal decomposition of ferrous oxalate?
#(iii)# represent the disproportionation of ferrous oxide?
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So how do you know? Got me.....?
Of course, you have to look at the context of the question.......#"Iron metal is heated under excess dioxygen gas for a "#
#"prolonged period........"# Such conditions, would favour oxidation to #"ferric iron"#.
#2Fe(s) + 3/2O_2(g) +Delta rarrFe_2O_3(s)#
On the other hand, #"iron oxalate"# can be thermally decomposed to #"iron oxide"# and #"carbon dioxide"# and #"carbon monoxide"#.
#FeC_2O_4(s)+Delta rarrFeO(s) + CO(g) + CO_2(g)#
On the other, other hand, #"ferrous oxide"# could disproportionate to give iron metal and the mixed oxidation state #"magnetite"#.....
#3FeO(s) + DeltararrFe(s) + Fe_2O_3(s)#
.........here #Fe_2O_3# #"aka magnetite"# is a mixed oxidation state iron oxide.......#FeO*FeO_2#, i.e. an #Fe(+IV)# centre........
Depending where you are, you should be spoon-fed this info.
