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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:
3
`2HgS+3O_2 to 2HgO+2SO_2, 2HgO+HgS to 3Hg+SO_2`
`Cu_2S+3O_2 to 3Cu_2O + 2SO_2 , 2Cu_2O + Cu_2S to 6Cu+SO_2`
`2PbS + 3O_2 to 2PbO + 2SO_2 , 2PbO + PbS to 3Pb+SO_2`
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