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`

Find the number of metals which are reduced by self-reduction from the given metals: Fe,Al,Zn,Sn,Pb,Hg,Cu

Find the number of metals which are commercially reduced by self-reduction from the gives metals Ag, Cr, Mn, Sn, Zn, Fe

Find the number of metals which are commercially reduced by self-reduction from the given metals : Fe, Al, Z, Sn, Pb, Hg, Cu .

Find the number of metals which are commercially reduced by self-reduction from the given metals : Fe, Al, Z, Sn, Pb, Hg, Cu .

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

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

How many of the following metals is extracted by self reduction process? Pb,Au,Mg,Sn,Fe,Al,Ag,Hg,Na,Zn,Cu,Ca