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Which represents correct chemical relations related to iron and it's compound ?
$Fe\xrightarrow{{dil\,{H_2}S{O_4}}}FeS{O_4}\xrightarrow{{{H_2}S{O_4},{O_2}}}Fe{\left( {S{O_4}} \right)_3}\xrightarrow{{heat}}Fe$
$Fe\xrightarrow{{{O_2}\,,heat}}FeO\xrightarrow{{dil\ {H_2}S{O_4}}}FeS{O_4}\xrightarrow{{heat}}Fe$
$Fe\xrightarrow{{C{l_2}\,,heat}}FeC{l_3}\xrightarrow{{heat,air}}FeC{l_2}\xrightarrow{{Zn}}Fe$
$Fe\xrightarrow[{excess}]{{{O_2},heat}}F{e_3}{O_4}\xrightarrow{{CO,600\,{}^oC}}F{e_2}{O_3}\xrightarrow{{CO,700\,{}^oC}}Fe$
Solution
In equation $1, FeCl _3$ cannot be reduced when heated in air.
In equation $3, Fe _2\left( SO _4\right)_3$ cannot convert to $Fe$ on heating; instead oxide(s) will be formed.
In equation $4, FeSO _4$ cannot be converted to $Fe$ on heating; instead oxide(s) will be formed.
