(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.

 

Related Chapters

Preparation Products

Knockout NEET May 2021

An exhaustive E-learning program for the complete preparation of NEET..

₹ 22999/- ₹ 14999/-
Buy Now
Knockout BITSAT 2020

It is an exhaustive preparation module made exclusively for cracking BITSAT..

₹ 4999/- ₹ 1999/-
Buy Now
Knockout NEET May 2022

An exhaustive E-learning program for the complete preparation of NEET..

₹ 34999/- ₹ 24999/-
Buy Now
Knockout JEE Main April 2021

An exhaustive E-learning program for the complete preparation of JEE Main..

₹ 22999/- ₹ 14999/-
Buy Now
Knockout JEE Main April 2022

An exhaustive E-learning program for the complete preparation of JEE Main..

₹ 34999/- ₹ 24999/-
Buy Now
Exams
Articles
Questions