In the industrial preparation of Potassium Dichromate, Chromite ore () is first roasted with Sodium — d and f Block Elements Chemistry Question
Question
In the industrial preparation of Potassium Dichromate, Chromite ore ($FeCr_2O_4$) is first roasted with Sodium Carbonate ($Na_2CO_3$) and air. What are the two primary products of this fusion step?
Answer: B
💡 Solution & Explanation
The balanced fusion reaction is $4FeCr_2O_4 + 8Na_2CO_3 + 7O_2 \to 8Na_2CrO_4 + 2Fe_2O_3 + 8CO_2$. Chromium is oxidized from $+3$ to $+6$ to form yellow, soluble Sodium Chromate. Iron is oxidized to insoluble $Fe_2O_3$.
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