Question

Match the extraction processes listed in Column I with metals listed in Column II:

Answer 1

1. Lead is extracted from its ore by reduction with carbon and self-reduction process.
$PbO+C⟶Pb+CO$
$PbS+2PbO⟶3Pb+S{O}_2$
2. The process of extraction of silver is called as cyanide process and sodium cyanide solution is used. In this complex formation takes place and the metal is obtained by displacement.
${Ag}_{2}S+4NaCN\rightleftharpoons 2Na\left[Ag{\left(CN\right)}_2\right]+{Na}_{2}S$
$Zn+2Na\left[Ag{\left(CN\right)}_2\right]⟶{Na}_2\left[Zn{\left(CN\right)}_4\right]+2Ag$
3. Copper can be extracted in the similar process of lead.
4. Heating of Boron trioxide with K yields amorphous form of boron [decomposition of iodide].