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Write the chemical equations involved in the extraction of lead from galena by self-reduction process.

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Lead is mainly extracted from sulphide ore called galena. Roasting is done followed by reduction with carbon. Self-reduction finally takes place.
`2PbS + 3O_(2) rarr 2PbO + SO_(2)`
`PbS + 2O_(2) rarr PbSO_(4)`
`PbSO_(4) + PbO rarr 2Pb + 2SO_(2)`
`PbS + 2PbO rarr 3Pb + SO_(2)`.
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Knowledge Check

  • Why lime stone is added in the extraction of lead from galena?

    A
    It prevents the formation of `PbSO_(4)`
    B
    It removes the impurity of silica as fusible slag.
    C
    It converts lead silicate to lead oxide
    D
    It moves the impurity of iron oxide as fusible slag.

  • Why lime stone is added in the extraction of lead from galena ?

    A
    It prevents the formation of `PbSO_4`
    B
    It remove the impurity of silica as fusible slag
    C
    It converts lead silicate to lead oxide
    D
    It remove the impurity of iron oxide as fusible slag

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