Zone Refining
Trending Questions
Explain the preparation of sodium fusion extract
What is the role of cryolite in the metallurgy of aluminium?
- Cupellation
- Zone refining
- Poling
- Electrolytic process
- True
- False
- Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
- Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
- Assertion is correct but Reason is incorrect
- Both Assertion and Reason are incorrect
Name the method of purification for producing semi-conductor or other metals of very high purity.
- Al
- Cu
- Ag
- Ge
- oxidation
- electrochemical
- crystallization
- zone refining
- Ge
- Si
- Ga
- Se
Explain:
Zone refining
Column chromatography .
Match the items of Column I with the items of Column II and assign the correct code.
Column IColumn IIA. Coloured bands1. Zone refiningB. Impure metal to volatile complex2. Fractional distillationC. Purification of Ge and Si3. Mond′s processD. Purification of mercury4. Chromatography5. Liquation
Codes
A B C D A B C D
(a) 1 2 4 5 (b) 4 3 1 2
(c) 3 4 2 1 (d) 5 4 3 2
- Ge
- Si
- Ga
- Se
Give reasons:
(i) Conc. HNO3 can be transported in aluminium container.
(ii) A mixture of dilute NaOH and aluminium pieces is used to open drain.
(iii) Graphite is used as lubricant.
(iv) Diamond is used as an abrasive.
(v) Aluminium alloys are used to make aircraft body.
(vi) Aluminium utensils should not be kept in water overnight.
(vii) Aluminium wire is used to make transmission cables.
77 ) Mention the appropriate term corresponding to following sentence
(iv) The hardest compound of silicon used in all kinds of grinding wheels
- carbon which reduces the impurities
- water which dissolves the impurities
- limestone which changes impurities into oxides and pass into slag
- iron oxide which reacts with impurities by forming slag
How are metals used as semiconductors refined? What is the principle of the method used like germanium, silicon etc?
- Cupellation
- Zone refining
- Poling
- Electrolytic process
- distillation
- zone refining
- electrolytic refining
- liquation
- Electrolytic refining
- Liquation
- Zone refining
- Distillation
- Liquation
- Vapour-phase refining
- Zone-refining
- Electrolysis
Column I | Column II | ||
(A) | Metals used as semiconductors | (i) | Aluminium |
(B) | Electrolytic reduction | (ii) | Zone refining |
(C) | Cyanide process | (iii) | Dressing of ZnS |
(D) | Froth floatation process | (iv) | Extraction of Ag |
- (A) →(i), (B)→(iii), (C)→(ii), (D) → (iv)
- (A) →(iii), (B)→(iv), (C)→(ii), (D) → (i)
- (A) →(iv), (B)→(ii), (C)→(iii), (D) → (i)
- (A) →(ii), (B)→(i), (C)→(iv), (D) → (iii)
You are an alchemist who is trying to remove hard lead impurity from Crude silver. You can only use thermal refining by using a blast of air. What would you use?
Van Arkel-de Boer Refining
Mond’s process
Linz-Donawitz process
Cupellation