(i) Write the role of  'CO' in the purification of nickel.

(ii) What is the role of silica in the extraction of copper ?

(iii) What type of metals are generally extracted by electrolytic method ?

 

 

 

 
 
 
 
 

Answers (1)
S Sumit

(i) CO forms a volatile complex Nickel tetracarbonyl,Ni(CO)_{4} leaving     behind impurities. The nickel tetracarbonyl complex is heated to a higher     temperature, decomposes to give pure metal.

            Ni+4CO\overset{360K}{\rightarrow}Ni(CO)_{4}

            Ni(CO)_{4}\overset{470K}{\rightarrow}\underset{pure}{Ni}+4CO

(ii) Silica \left [ SiO_{2} \right ] acts as a flux, added before roasting to combine with 

      FeO [impurity] and form FeSiO_{3}  [slag]

        FeO+SiO_{2}\rightarrow FeSiO_{3}

(iii) Very highly reactive metals like sodium, Potassium,calcium etc are        generally extracted by electrolytic method.

 

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