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JEE Main2014ChemistryGeneral Principles and Processes of Isolation of MetalsActual

Which series of reactions correctly represents the chemical relations related to iron and its compound?

Options

  1. AFe → dilute   H 2 SO 4 FeSO 4 → H 2 SO 4 , O 2 Fe 2 SO 4 3 → heat Fe
  2. BFe → O 2 ,   heat FeO → dilute   H 2 SO 4 FeSO 4 → heat Fe
  3. CFe → Cl 2 ,   heat FeCl 3 → heat ,   air FeCl 2 → Zn Fe
  4. DFe → O 2 ,   heat Fe 3 O 4 → CO ,   600 ℃ FeO → CO ,   700 ℃ Fe

Correct answer

D. Fe → O 2 ,   heat Fe 3 O 4 → CO ,   600 ℃ FeO → CO ,   700 ℃ Fe

Step-by-step solution

This is the blast furnace reaction. Fe → dilute   H 2 SO 4 FeSO 4 → H 2 SO 4 ,   O 2 Fe 2 SO 4 3 → heat Fe and Fe → O 2 ,   heat FeO → dilute   H 2 SO 4 FeSO 4 → heat Fe cannot be the answer since, FeSO 4 on heating gives FeO and SO 2 . Fe → Cl 2 ,   heat FeCl 3 → heat ,   air FeCl 2 → Zn Fe is wrong because FeCl 3 , on heating in air, stays as Fe + 3 and does not form FeCl 2 .

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