Question

Answer fast❤❤

Only cahemistry geniues.​

Answer 1

a) Lower - roasting...

ex - mercury

Middle- roasting and calcination.

ex- zinc

b) Because metals have free ions which conducts electricity!!!!

Answer 2

   ⇒       Metals of high reactivity can be extracted by

             the process of Electrolytic Reduction

Electrolytic Reduction: Electric current is passed through the molten state of       metal ores. Metal; being positively charged; is deposited over the cathode.

Example: When electric current is passed through molten state or solution          of sodium chloride, sodium metal deposited over cathode.

Na+ + e− ⇨ Na  

2Cl− − e− ⇨ Cl2

2NaCl ⇨ 2Na + Cl2

⇒       Metals of low reactivity can be extracted by

             the process of roasting and calcination

  roasting is the extraction of metals from by heating in presence of                            

  oxygen.

  I.e Cinnebar (HgS) is heated with O2 which gives SO2 and Hg.

   HgS + O2 ---------- Hg + SO2

     while calcination is the heating the ore without oxygen.i.e Ferric    

    Oxide (Fe3O4) is heated with carbon then they release Fe and CO2.