an ore releases SO2 gas on heating. how will you convert this ore into the metal? explain with equation.

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Solution

Dear student!
If any ore releases sulphur dioxide (SO₂) gas, it must be a sulphide ore, which is first concentrated by froth floatation method and then followed by roasting , reduction and electrolysis. For ex: in the case of Lead sulphide we get the extraction as :
1.Concentration: The finely powdered PbS is concentrated by froth floatation method.
2. Reduction via roasting process : The concentrated ore is heated in air to produce lead oxide and lead sulphate
2PbS + 3O₂ --> 2PbO + 2SO₂
PbS + 2O₂ --> PbSO₄
3.Smelting: Roasted ore is mixed with coke and lime and smelted in a blast furnace where impure lead is obtained.
PbO + C -> Pb + CO
PbO + CO -> Pb + CO₂
4. Purification : Now the impure lead is purified by electrolysis.

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