Complete the following reactions:(a) 4FeCr_2O | vedclass

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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 chr

Vedclass · Accepted Answer

$X = Na_2CO_3$ in $(a)$ and $X = 2H^+$ in $(b)$

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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 chromate $(Na_2CrO_4)$. Thus,$X = Na_2CO_3$.In reaction $(b)$,sodium chromate $(Na_2CrO_4)$ is converted into sodium dichromate $(Na_2Cr_2O_7)$ by the addition of an acid (like $H_2SO_4$),which provides $H^+$ ions. The reaction is: $2Na_2CrO_4 + 2H^+ 	o Na_2Cr_2O_7 + 2Na^+ + H_2O$. Thus,$X = 2H^+$.

Complete the following reactions:
$(a)$ $4FeCr_2O_4 + 8Na_2CO_3 + 7O_2 \to 8Na_2CrO_4 + 2Fe_2O_3 + 8CO_2$
$(b)$ $2Na_2CrO_4 + 2H^+ \to Na_2Cr_2O_7 + 2Na^+ + H_2O$
Identify the species $X$ in both reactions.

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Complete the following reactions:$(a)$ $4FeCr_2O_4 + 8Na_2CO_3 + 7O_2 \to 8Na_2CrO_4 + 2Fe_2O_3 + 8CO_2$$(b)$ $2Na_2CrO_4 + 2H^+ \to Na_2Cr_2O_7 + 2Na^+ + H_2O$Identify the species $X$ in both reactions.