Which of the following ores is concentrated b | vedclass

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(B) Leaching is a chemical process in which the powdered ore is treated with a suitable reagent that selectively dissolves the ore while leaving the i

Vedclass · Accepted Answer

$Al_2O_3 \cdot 2H_2O$

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(B) Leaching is a chemical process in which the powdered ore is treated with a suitable reagent that selectively dissolves the ore while leaving the impurities in an undissolved state. Bauxite,which is the principal ore of aluminium $(Al_2O_3 \cdot 2H_2O)$,is concentrated using this method (Bayer's process). In this process,bauxite is treated with an aqueous solution of sodium hydroxide $(NaOH)$. Alumina dissolves to form soluble sodium aluminate,while impurities like ferric oxide $(Fe_2O_3)$,titanium oxide $(TiO_2)$,and silica $(SiO_2)$ remain undissolved. The chemical reaction is: $Al_2O_3(s) + 2NaOH(aq) + 3H_2O(l) \longrightarrow 2Na[Al(OH)_4](aq)$.

Metal	Ores and Composition
$Aluminium$	$Bauxite: AlO_{x}(OH)_{3-2x} (0 < x < 1)$; $Kaolinite: [Al_{2}(OH)_{4}Si_{2}O_{5}]$
$Iron$	$Haematite: Fe_{2}O_{3}$; $Magnetite: Fe_{3}O_{4}$; $Siderite: FeCO_{3}$; $Iron pyrites: FeS_{2}$
$Copper$	$Copper pyrites: CuFeS_{2}$; $Malachite: CuCO_{3} \cdot Cu(OH)_{2}$; $Cuprite: Cu_{2}O$; $Copper glance: Cu_{2}S$
$Zinc$	$Zinc blende or Sphalerite: ZnS$; $Calamine: ZnCO_{3}$; $Zincite: ZnO$

$I$	$II$
$X$. Magnetic separation	$a$. $Ag_2S$
$Y$. Froth floatation	$b$. $FeCr_2O_4$
$Z$. Gravity separation	$c$. $Al_2(SiO_3)_3$

Which of the following ores is concentrated by the process of leaching?

Similar Questions

Match the method of concentration of the ore in column $I$ with the ore in column $II$ and select the correct alternate :

$I$ $II$

$X$. Magnetic separation $a$. $Ag_2S$

$Y$. Froth floatation $b$. $FeCr_2O_4$

$Z$. Gravity separation $c$. $Al_2(SiO_3)_3$

Which principle is involved in magnetic separation?

Leaching is commercially carried out for the concentration of which of the following ores?

Reagent used in Bayer's process of concentration of bauxite ore is:

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