The fusion of chromite ore (FeCr_{2}O_{4}) wi | vedclass

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(A) The fusion of chromite ore $(FeCr_{2}O_{4})$ with $Na_{2}CO_{3}$ in the presence of air produces sodium chromate $(Na_{2}CrO_{4})$,which forms a y

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$Na_{2}CrO_{4}$ and $Na_{2}Cr_{2}O_{7}$

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(A) The fusion of chromite ore $(FeCr_{2}O_{4})$ with $Na_{2}CO_{3}$ in the presence of air produces sodium chromate $(Na_{2}CrO_{4})$,which forms a yellow-coloured aqueous solution.$8Na_{2}CO_{3} + 4FeCr_{2}O_{4} + 7O_{2} \longrightarrow 8Na_{2}CrO_{4} + 2Fe_{2}O_{3} + 8CO_{2}$Subsequent acidification of the yellow solution with $H_{2}SO_{4}$ converts the chromate ion into the dichromate ion,resulting in an orange-coloured solution.$2Na_{2}CrO_{4} + H_{2}SO_{4} \longrightarrow Na_{2}Cr_{2}O_{7} + Na_{2}SO_{4} + H_{2}O$Thus,the yellow colour is due to $Na_{2}CrO_{4}$ and the orange colour is due to $Na_{2}Cr_{2}O_{7}$.

The fusion of chromite ore $(FeCr_{2}O_{4})$ with $Na_{2}CO_{3}$ in air gives a yellow solution upon addition of water. Subsequent treatment with $H_{2}SO_{4}$ produces an orange solution. The yellow and orange colours,respectively,are due to the formation of

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