By which process Pb and Sn are extracted respectively are:

By which process Pba and Sn are extracted respectively are:

By which process Hg and Sn are extracted, respectively?

[" By which process "Pb" and "" Sn are extracted by "-],[" (A) Extracted carbon reduction: Self reduction "],[" (B) Self reduction: Carbon reduction "],[" (C) Electrolytic reduction: Cyanide process "],[" (D) Cynide process electrolytic reduction "]

Pb and Sn are extracted from their chief ore by :

Pb and Sn are extracted from their chief ore by

Pb and Sn are extracted from their chief ore by