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(A) $1$. Calcination is the process of heating an ore in the absence of air to remove moisture and volatile impurities. The reaction $Fe_2O_3 \cdot nH

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$I-a, II-b, III-c, IV-d$

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(A) $1$. Calcination is the process of heating an ore in the absence of air to remove moisture and volatile impurities. The reaction $Fe_2O_3 \cdot nH_2O \rightarrow Fe_2O_3 + nH_2O$ represents the removal of water of hydration,which is a calcination process $(I-a)$.$2$. Roasting is the process of heating a sulphide ore in the presence of excess air. The reaction $2Cu_2S + 3O_2 \rightarrow 2Cu_2O + 2SO_2$ is a classic example of roasting $(II-b)$.$3$. Flux is a substance added to remove gangue. $SiO_2$ acts as an acidic flux to remove $FeO$ (basic gangue) to form slag $FeSiO_3$ $(III-c)$.$4$. Thermite process involves the reduction of metal oxides using aluminum powder. The reaction $Cr_2O_3 + 2Al \rightarrow Al_2O_3 + 2Cr$ is a thermite reaction $(IV-d)$.Therefore,the correct matching is $I-a, II-b, III-c, IV-d$.

List-$I$	List-$II$
$(I)$ Calcination	$a. Fe_2O_3 \cdot nH_2O \rightarrow Fe_2O_3 + nH_2O$
$(II)$ Roasting	$b. 2Cu_2S + 3O_2 \rightarrow 2Cu_2O + 2SO_2$
$(III)$ Flux	$c. SiO_2 + FeO \rightarrow FeSiO_3$
$(IV)$ Thermite	$d. Cr_2O_3 + 2Al \rightarrow Al_2O_3 + 2Cr$

Match the following:

List-$I$ List-$II$

$(I)$ Calcination $a. Fe_2O_3 \cdot nH_2O \rightarrow Fe_2O_3 + nH_2O$

$(II)$ Roasting $b. 2Cu_2S + 3O_2 \rightarrow 2Cu_2O + 2SO_2$

$(III)$ Flux $c. SiO_2 + FeO \rightarrow FeSiO_3$

$(IV)$ Thermite $d. Cr_2O_3 + 2Al \rightarrow Al_2O_3 + 2Cr$

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Match the following: List-$I$ List-$II$ $(I)$ Calcination $a. Fe_2O_3 \cdot nH_2O \rightarrow Fe_2O_3 + nH_2O$ $(II)$ Roasting $b. 2Cu_2S + 3O_2 \rightarrow 2Cu_2O + 2SO_2$ $(III)$ Flux $c. SiO_2 + FeO \rightarrow FeSiO_3$ $(IV)$ Thermite $d. Cr_2O_3 + 2Al \rightarrow Al_2O_3 + 2Cr$