The froth floatation process used for the con | vedclass

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(D) . The froth floatation process is based on the difference in wettability of different minerals. The metallic sulphide particles are preferentially

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All are correct statements.

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(D) . The froth floatation process is based on the difference in wettability of different minerals. The metallic sulphide particles are preferentially wetted by oil,while the gangue particles are wetted by water.$B$. Sodium ethyl xanthate $(C_2H_5OCS_2Na)$ acts as a collector. It attaches to the mineral grains via polar groups,making them water-repellent so they pass into the froth.$C$. $NaCN$ is used as a depressant to separate $ZnS$ and $PbS$. It forms a soluble complex with $ZnS$ $(Na_2[Zn(CN)_4])$,preventing it from floating,while $PbS$ remains in the froth.Therefore,all the given statements are correct.

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

The froth floatation process used for the concentration of sulphide ore:

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$4 Ag_{(s)} + 8 CN^{-}_{(aq)} + 2 H_2O_{(l)} + O_{2(g)} \longrightarrow 4 [Ag(CN)_2]^{-}_{(aq)} + 4 OH^{-}_{(aq)}$
The above reaction represents the process of concentration of ore in the extraction of silver. This process is:

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