(B) The chemical reaction for the fusion of chromite ore with sodium carbonate in the presence of oxygen is:$4FeCr_2O_4 + 8Na_2CO_3 + 7O_2 \rightarrow

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(B) The chemical reaction for the fusion of chromite ore with sodium carbonate in the presence of oxygen is:$4FeCr_2O_4 + 8Na_2CO_3 + 7O_2 \rightarrow 8Na_2CrO_4 + 2Fe_2O_3 + 8CO_2$In this reaction,$Na_2CrO_4$ (sodium chromate) is water-soluble,while $Fe_2O_3$ (ferric oxide) is water-insoluble.The molar mass of $Fe_2O_3$ is calculated as:$M = (2 \times 56) + (3 \times 16) = 112 + 48 = 160 \ g \ mol^{-1}$.

Class 12 Chemistry General Principles and Processes of Isolation of Elements Mix Examples of General Principles and processes of Isolation of Elements

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The molar mass of the water-insoluble product formed from the fusion of chromite ore $(FeCr_2O_4)$ with $Na_2CO_3$ in the presence of $O_2$ is $..........$ $g \ mol^{-1}$.

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A
$260$
B
$160$
C
$360$
D
$460$

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General Principles and Processes of Isolation of Elements

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Mix Examples of General Principles and processes of Isolation of Elements

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Match Column-$I$ with Column-$II$.

Column-$I$ Column-$II$

$P$. Nitriding $I$. Process of heating steel to redness and then cooling it very slowly

$Q$. Annealing $II$. Process of heating steel in presence of $NH_3$ and producing hard coating of Iron Nitride on the surface of steel

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Column-$I$	Column-$II$
$P$. Nitriding	$I$. Process of heating steel to redness and then cooling it very slowly
$Q$. Annealing	$II$. Process of heating steel in presence of $NH_3$ and producing hard coating of Iron Nitride on the surface of steel
$R$. Tempering	$III$. Process of heating steel to redness and then cooling it suddenly by plunging it into water or oil
$S$. Quenching	$IV$. Process of heating quenched steel to a temperature well below redness and then cooling it slowly