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(D) The manufacturing process of $K_{2}Cr_{2}O_{7}$ from chromite ore $(FeCr_{2}O_{4})$ involves three main steps:$1$. Conversion of chromite ore into

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$Sodium \ chromate$

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(D) The manufacturing process of $K_{2}Cr_{2}O_{7}$ from chromite ore $(FeCr_{2}O_{4})$ involves three main steps:$1$. Conversion of chromite ore into sodium chromate:$4FeCr_{2}O_{4} + 8Na_{2}CO_{3} + 7O_{2} \longrightarrow 2Fe_{2}O_{3} + 8CO_{2} + 8Na_{2}CrO_{4}$$2$. Conversion of sodium chromate into sodium dichromate:$2Na_{2}CrO_{4} + H_{2}SO_{4} \longrightarrow Na_{2}Cr_{2}O_{7} + Na_{2}SO_{4} + H_{2}O$$3$. Conversion of sodium dichromate to potassium dichromate:$Na_{2}Cr_{2}O_{7} + 2KCl \longrightarrow K_{2}Cr_{2}O_{7} + 2NaCl$In the first step,$Na_{2}CrO_{4}$ (sodium chromate) is produced. This $Na_{2}CrO_{4}$ is then used as a reactant in the second step to produce $Na_{2}Cr_{2}O_{7}$.

Which of the following is a product of the first step and is used as a reactant in the next step for the manufacture of $K_{2}Cr_{2}O_{7}$ from concentrated chromite ore?

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