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)

               

  • Option 1)

    (iv)    (ii)    (iii)    (i)

  • Option 2)

    (ii)    (iii)    (i)    (v)

  • Option 3)

    (i)    (ii)    (iii)    (iv)

  • Option 4)

    (iii)    (iv)    (v)    (i)

 

Answers (1)

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 \overset{O2}{\rightarrow} Na [Ag (CN)2

Na [Ag (CN)2] + Zn{\rightarrow} Na2 [Zn(CN)4] +Ag {\downarrow}

 

 

 

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

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