Match items of Column I with the item of Column II and assign the correct code :
Column I |
Column II |
(a) Cynide process |
(i) Ultrapure Ge |
(b) Froth floatation process |
(ii) Dressing of ZnS |
(c) Electrolytic reduction |
(iii) Extraction of Al |
(d) Zone refining |
(iv) Extraction of Au |
(v) Purification of Ni |
Code:
(a) (b) (c) (d)
(iv) (ii) (iii) (i)
(ii) (iii) (i) (v)
(i) (ii) (iii) (iv)
(iii) (iv) (v) (i)
As we learned in concept
Froth floatation process -
This method is mainly for the concentration of sulphide ores.The method is based on the different wetting characteristics of the gangue and the sulphide ore with water and oil
- wherein
The gangue preferentially wetted by water and the ore by oil.
Electrolytic Refining -
Many of the metals such as Cu,Au,Ag,Al,Hb etc are purified by this method.
- wherein
The impure metal is made anode while a thin sheet of pure metal acts as a cathode.
Zone Refining -
A movable heater is fitted around a rod of impure metal.The heater is slowly moved across the rod.The metal melt at the point of heating and as the heater moves on from one end of the rod to the other end, the pure metal crystallised while the impurities pass on adjacent melted zone.
- wherein
Leaching -
In this process we use suitable agent which react with ore to form water soluble complex while impurities are insoluble
- wherein
Ag2S +NaCN Na [Ag (CN)2]
Na [Ag (CN)2] + Zn Na2 [Zn(CN)4] +Ag
Au forms a water soluble co-ordinate complex with cyanide which is then used to convert to Au. Froth floatation process is used to extract sulphide ores like ZnS, PleS etc.
Electrolytic reduction is used to extract aluminum from bauxite
Zone refining is used to get ultrapure Ge
Option 1)
(iv) (ii) (iii) (i)
This option is correct
Option 2)
(ii) (iii) (i) (v)
This option is incorrect
Option 3)
(i) (ii) (iii) (iv)
This option is incorrect
Option 4)
(iii) (iv) (v) (i)
This option is incorrect