(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)

(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.

 

Most Viewed Questions

Related Chapters

Preparation Products

Knockout CUET (Physics, Chemistry and Mathematics)

Complete Study Material based on Class 12th Syllabus, 10000+ Question Bank, Unlimited Chapter-Wise and Subject-Wise Mock Tests, Study Improvement Plan.

₹ 7999/- ₹ 4999/-
Buy Now
Knockout CUET (Physics, Chemistry and Biology)

Complete Study Material based on Class 12th Syllabus, 10000+ Question Bank, Unlimited Chapter-Wise and Subject-Wise Mock Tests, Study Improvement Plan.

₹ 7999/- ₹ 4999/-
Buy Now
Knockout JEE Main (Six Month Subscription)

- AI Coach Study Modules, - Unlimited Mock Tests, - Study Improvement Plan.

₹ 9999/- ₹ 8499/-
Buy Now
Knockout JEE Main (Nine Month Subscription)

- AI Coach Study Modules, - Unlimited Mock Tests, - Study Improvement Plan.

₹ 13999/- ₹ 12499/-
Buy Now
Knockout NEET (Six Month Subscription)

- AI Coach Study Modules, - Unlimited Mock Tests, - Study Improvement Plan.

₹ 9999/- ₹ 8499/-
Buy Now
Boost your Preparation for JEE Main with our Foundation Course
 
Exams
Articles
Questions