Chromite ore xrightarrow{Na_2CO_3 + O_2} A xr | vedclass

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(D) The extraction of chromium from chromite ore $(FeCr_2O_4)$ involves the following steps:$1$. Fusion of chromite ore with sodium carbonate in the p

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Both $(B)$ and $(C)$

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(D) The extraction of chromium from chromite ore $(FeCr_2O_4)$ involves the following steps:$1$. Fusion of chromite ore with sodium carbonate in the presence of air: $4FeCr_2O_4 + 8Na_2CO_3 + 7O_2 	o 8Na_2CrO_4 + 2Fe_2O_3 + 8CO_2$. Here,$A$ is $Na_2CrO_4$ (sodium chromate).$2$. Conversion of sodium chromate to sodium dichromate by acidification with sulfuric acid: $2Na_2CrO_4 + H_2SO_4 	o Na_2Cr_2O_7 + Na_2SO_4 + H_2O$. Here,$B$ is $Na_2Cr_2O_7$ (sodium dichromate).$3$. Sodium dichromate can be converted back to sodium chromate by adding $NaOH$: $Na_2Cr_2O_7 + 2NaOH 	o 2Na_2CrO_4 + H_2O$.Thus,both $A = Na_2CrO_4$ and $B = Na_2Cr_2O_7$ are correct.

List-$I$ (Transition metal/Compound/complex)	List-$II$ (Catalytic Role)
$A$. $V_2O_5$	$I$. Preparation of ammonia from $N_2/H_2$ mixture
$B$. $Fe$	$II$. Polymerisation of alkynes
$C$. $PdCl_2$	$III$. Preparation of $H_2SO_4$ from $SO_2$
$D$. $Ni$ complex	$IV$. Oxidation of ethyne to ethanal

Chromite ore $\xrightarrow{Na_2CO_3 + O_2} A$ $\xrightarrow[NaOH]{H_2SO_4} B$. Which of the following is correct?

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