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Among the following metals how many meta...

Among the following metals how many metals are extracted by self-reduction method from their respective ores. (Give total number ).Hg , Zn, Cu, Al, Mg , Pb, Fe, Sn

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The correct Answer is:
C
`2HgS+3O_(2) to 2HgO+2SO_(2),2HgO+HgS to 3Hg+SO_(2)`
`Cu_(2)S+3O_(2)to 3CuO+2SO_(2),2CuO+Cu_(2)Sto 6Cu+SO_(2)`
`2PbS +3SO_(2) to 2PbO+2SO_(2),`
`2PbP+PbS to 3Pb+SO_(3)`
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