Question

suggest different chemical processes used for obtaining a metal from its oxides for metals in the middle of the reactivity series and metal towards the top of the reactivity series.support your answers with one example each

Answer 1

Metals from Their Oxides:

The metals placed Higher at the reactivity series (K to Al) :
They have a strong affinity for oxygen and are most electropositive and so cannot be reduced by reducing agent alone..so they are reduced to metals by ELECTROLYSIS

The metals which are placed at middle of reactivity series (Zn to Cu) :
They are less electropositive and have less affinity for oxygen and so can be reduced to metals by Reducing agents like C,CO..

The metals which are at the last of reactivity series (Hg and Ag) :
They are least electropositive and have least affinity for oxygen and can be reduced to metal only by heating alone..

Hope it Helps..

Answer 2

Metals in middle of the reactivity series are found in its sulphide or carbonate ores. Calcination is a process of heating the ore with limited or no supply of air.the products are metal oxide with carbon dioxide.

Roasting is a process of heating the ore with supply of air. Products are metal oxide along with sulphur dioxide.

example :Zn

ZnCO3-->ZnO+CO2

2ZnS+3O2-->2ZnO+2SO2

metals of high reactivity are obtained using electrolysis reduction

example:NaCl-->(Na+)+(Cl-)

the metals of high reactivity are found in chlorides