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(C) Potassium dichromate $(K_2Cr_2O_7)$ is prepared from chromite ore $(FeCr_2O_4)$.The process involves the following steps:$1$. Fusion of chromite o

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$FeCr_2O_4$ (Chromite ore)

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(C) Potassium dichromate $(K_2Cr_2O_7)$ is prepared from chromite ore $(FeCr_2O_4)$.The process involves the following steps:$1$. Fusion of chromite ore with sodium carbonate in the presence of excess air: $4FeCr_2O_4 + 8Na_2CO_3 + 7O_2 \rightarrow 8Na_2CrO_4 + 2Fe_2O_3 + 8CO_2$.$2$. The yellow solution of sodium chromate is filtered and acidified with sulfuric acid to give a solution from which orange sodium dichromate $(Na_2Cr_2O_7 \cdot 2H_2O)$ can be crystallized.$3$. Sodium dichromate is more soluble than potassium dichromate. The latter is prepared by treating the solution of sodium dichromate with potassium chloride: $Na_2Cr_2O_7 + 2KCl \rightarrow K_2Cr_2O_7 + 2NaCl$.

Which of the following compounds is used as the starting material for the preparation of potassium dichromate?

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