Choose the correct option the code regar...

Choose the correct option the code regarding roasting process.
(I) It is the process of heating the ore in air in a reverberatory furnace to obtain the oxide.
(II) It is an exothermic process.
(III) It is used for the concentration of sulphide ore.
(Iv) It removes easily oxidisable volatile impurities present in the concentrated ore.

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Choose the correct code regarding Roasting process. (I) It is the process of heating ore in air to obtain the oxide (II) It is an exothermic process (III) It is used for hydrated oxide and oxysalt ore (IV) It is used after the concentration of ore

Froth floatation process used for the concentration of sulphide ore :

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