Answer
424.8k+ views
Hint: Zone refining: It is used for refining \[Si,\,B,\,Ga,\,In,\] etc. impurities are more soluble in molten states of metal than in solid states.
>Electrorefining: It is carried out for refining of impure zinc. The anode is impure zinc and cathode is pure zinc.
>Vapor phase refining: Metal is converted into volatile compound and then decomposed to obtain pure metal.
Complete answer:
(i) Zone refining: Semiconductors like \[Si,Ge,Ga,\] etc. are purified by this method. Impurities are highly soluble in molten metal than in solid metal. This method is based on fractional crystallization. A circular heater surrounds a rod of impure metal. The heater is moved then the pure metal crystallizes out and impurities pass into the adjacent molten metal. The metal is repeated to shift the impurities to one end which is cut off.
(ii) Electrolytic refining: In this method, impure copper metal is taken as anode and pure copper metal at cathode. Electrolyte is aqueous solution of some suitable salt of copper. On passing current, impure metal from anode gives metal ions into the solution and from the solution the metal ions produce metal at cathode. Sometimes the waste under the anode (anode mud) may contain precious metals, as in case of copper, the anode mud may contain gold, silver, zinc, etc.
\[
At{\text{ }}anode\,\mathop {Cu}\limits_{impure} \to \mathop {Cu}\limits^{ + 2} + \mathop {2e}\limits^ - \\
At{\text{ cathode}}\,\mathop {Cu}\limits^{ + 2} + \mathop {2e}\limits^ - \to \mathop {Cu}\limits_{pure} \\
\]
(iii) Vapor phase refining: It is the process of refining metal by converting it into its volatile compound and then decomposing it to obtain a pure metal. The metal should form a volatile compound with an available reagent. The volatile compound should be easily decomposed so that the metal can be easily recovered like Nickel, zirconium and titanium.
Note:: Refining of a metal depends upon the nature of the metal and nature of impurities. The other methods used in refining of metals are liquation, distillation, oxidative refining, poling etc.
>Electrorefining: It is carried out for refining of impure zinc. The anode is impure zinc and cathode is pure zinc.
>Vapor phase refining: Metal is converted into volatile compound and then decomposed to obtain pure metal.
Complete answer:
(i) Zone refining: Semiconductors like \[Si,Ge,Ga,\] etc. are purified by this method. Impurities are highly soluble in molten metal than in solid metal. This method is based on fractional crystallization. A circular heater surrounds a rod of impure metal. The heater is moved then the pure metal crystallizes out and impurities pass into the adjacent molten metal. The metal is repeated to shift the impurities to one end which is cut off.
(ii) Electrolytic refining: In this method, impure copper metal is taken as anode and pure copper metal at cathode. Electrolyte is aqueous solution of some suitable salt of copper. On passing current, impure metal from anode gives metal ions into the solution and from the solution the metal ions produce metal at cathode. Sometimes the waste under the anode (anode mud) may contain precious metals, as in case of copper, the anode mud may contain gold, silver, zinc, etc.
\[
At{\text{ }}anode\,\mathop {Cu}\limits_{impure} \to \mathop {Cu}\limits^{ + 2} + \mathop {2e}\limits^ - \\
At{\text{ cathode}}\,\mathop {Cu}\limits^{ + 2} + \mathop {2e}\limits^ - \to \mathop {Cu}\limits_{pure} \\
\]
![seo images](https://www.vedantu.com/question-sets/8eb77ee7-1892-45ba-8785-2fb03f9022ec752915345927439513.png)
(iii) Vapor phase refining: It is the process of refining metal by converting it into its volatile compound and then decomposing it to obtain a pure metal. The metal should form a volatile compound with an available reagent. The volatile compound should be easily decomposed so that the metal can be easily recovered like Nickel, zirconium and titanium.
Note:: Refining of a metal depends upon the nature of the metal and nature of impurities. The other methods used in refining of metals are liquation, distillation, oxidative refining, poling etc.
Recently Updated Pages
How many sigma and pi bonds are present in HCequiv class 11 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Why Are Noble Gases NonReactive class 11 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let X and Y be the sets of all positive divisors of class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let x and y be 2 real numbers which satisfy the equations class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let x 4log 2sqrt 9k 1 + 7 and y dfrac132log 2sqrt5 class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let x22ax+b20 and x22bx+a20 be two equations Then the class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Trending doubts
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
At which age domestication of animals started A Neolithic class 11 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Which are the Top 10 Largest Countries of the World?
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Give 10 examples for herbs , shrubs , climbers , creepers
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference Between Plant Cell and Animal Cell
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Write a letter to the principal requesting him to grant class 10 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Change the following sentences into negative and interrogative class 10 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Fill in the blanks A 1 lakh ten thousand B 1 million class 9 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)