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By heating chromite with Na2CO3, Na2CrO4 is obtained. Which of the following reactions is correct?

1. 4 FeCr2O4 + 8 Na2CO3 + 7 O2 → 8 Na2CrO4 + 2 Fe2O3 + 8 CO2
2. 4 FeCr2O4 + 8 Na2CO3 + 7 O2 → 8 Na2CrO4 + 2 Fe2O3 + 8 CO
3. 4 FeCr2O4 + 8 Na2CO3 + 7 O2 → 8 Na2CrO4 + 2 Fe2O3 + 8 H2O
4. 4 FeCr2O4 + 8 Na2CO3 + 7 O2 → 8 Na2CrO4 + 2 Fe2O3 + 8 N2

Correct answer: 4 FeCr2O4 + 8 Na2CO3 + 7 O2 → 8 Na2CrO4 + 2 Fe2O3 + 8 CO2

Solution

The reaction involves the oxidation of chromite (FeCr2O4) in the presence of sodium carbonate (Na2CO3) and oxygen (O2), producing sodium chromate (Na2CrO4), iron(III) oxide (Fe2O3), and carbon dioxide (CO2). Option A correctly represents this reaction.

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