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(A) In reaction $(a)$, the roasting of chromite ore $(FeCr_2O_4)$ with sodium carbonate $(Na_2CO_3)$ in the presence of air $(O_2)$ produces sodium ch

Vedclass · Accepted Answer

$X_1 = Na_2CO_3$ and $X_2 = 2H^+$

Vedclass · Answer

(A) In reaction $(a)$, the roasting of chromite ore $(FeCr_2O_4)$ with sodium carbonate $(Na_2CO_3)$ in the presence of air $(O_2)$ produces sodium chromate $(Na_2Cr_2O_4)$. Thus, $X_1 = Na_2CO_3$.In reaction $(b)$, sodium chromate $(Na_2Cr_2O_4)$ is converted into sodium dichromate $(Na_2Cr_2O_7)$ by the addition of an acid (like $H_2SO_4$), which provides $H^+$ ions. The balanced reaction is: $2Na_2Cr_2O_4 + 2H^+ 	o Na_2Cr_2O_7 + 2Na^+ + H_2O$. Thus, $X_2 = 2H^+$.

Consider the following chemical reactions involved in the extraction of chromium from chromite ore:
$(a)$ $4FeCr_2O_4 + X_1 + 7O_2 \to 8Na_2CrO_4 + 2Fe_2O_3 + 8CO_2$
$(b)$ $2Na_2CrO_4 + X_2 \to Na_2Cr_2O_7 + 2Na^+ + H_2O$
Identify the species $X_1$ and $X_2$ in the reactions.

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Consider the following chemical reactions involved in the extraction of chromium from chromite ore:$(a)$ $4FeCr_2O_4 + X_1 + 7O_2 \to 8Na_2CrO_4 + 2Fe_2O_3 + 8CO_2$$(b)$ $2Na_2CrO_4 + X_2 \to Na_2Cr_2O_7 + 2Na^+ + H_2O$Identify the species $X_1$ and $X_2$ in the reactions.