How many metals are commercially purified by electrolysis method from the given metals ?
`Na, Al, Pb, Ni`.

How many metals are commercially purified by Van Arkel method from the given metal ? Ti, B,Zr,Pb,Hg .

How many metals are commercially purified by Van Arkel method from the given metal ? Ti, B,Zr,Pb,Hg .

How many metals are commercially extracted by electrometallurgy from the given metals? Al, Mg, Na, K, A, Hg. Ti, Th, Zt, B

How many metals are commercially extracted by electrometallury form the given metals ? Al, Mg, Na, K, Ag, Hg, Ti, Th,Zr,B .

How many metals are commercially extracted by electrometallury form the given metals ? Al, Mg, Na, K, Ag .

How many metals are commercially extracted by hydro metallurgy from the given metals Ag, Mn, In, Cr, Pb, Au

How many metals are commercially extracted by hydrometallurgy from the given metals : Ag, Mn, In, Cr,Pb,Au .

How many metals are commercially extracted by hydrometallurgy from the given metals : Ag, Mn, In, Cr,Pb,Au .

How mant metals are commercially extracted by pyrometallurgy from the given metal ? Cu, Fe, Sn, Au, K, Na .