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The number of sulphide ores which are reduced by self redcution to produce their respective crude metals are: `ZnS,Cu_(2)S,PbS, FeS_(2), HgS`

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The number of sulphide ores which are reduced by self redcution to produce their respective crude metals are:
`ZnS,Cu_(2)S,PbS, FeS_(2), HgS`
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Correct Answer - 3
`Cu_(2)S, PbS,HgS`
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