With respect to an ore, Ellingham diagram helps to predict the feasibility of its
Thermal reduction
Electrolysis
Zone refining
Vapour phase refining
Assertion: For the extraction of iron, haematite ore is used.
Reason: Haematite is a carbonate ore of iron.
Both the assertion and reason are correct and the reason is the correct explanation for the assertion.
Only the assertion is correct.
Both the assertion and reason are correct, but the reason is not the correct explanation for the assertion
Only the reason is correct
The Mond process is used for the:
extraction of Zn
purification of Ni
purification of Zr and Ti
extraction of Mo
The ore that contains the metal in the form of fluoride is
cryolite
malachite
magnetite
Sphalerite
Match the refining methods (column I) Watch metals (column-II)
Column I Refinging methods |
Column II Metal |
I) Liquation | a) Zr |
II) Zone refinging | b) Ni |
III) Mond proced | c) Sn |
IV) Van Arkel Method | d) Ga |
I-b, II- c, III-d, IV-a
I-c, II-d, III-b, IV-a
I-c, II-a, III-b, IV-d
I-b, II-d, III-a, IV-c
The correct statement is :
Zincite is a carbonate ore.
Zone refining process is used for the refining of titanium
Aniline is a for the stabilizer
Sodium cyanide cannot be used in the metallurgy of silver
Match items of Columns I with the items of Columns II and assign the correct code.
Column I |
Column II |
A.Cyanide process |
1.Ultrapure Ge |
B. Froth floatation process |
2.Dressing of ZnS |
C.Electrolytic reduction |
3.Extraction of Al |
D.Zone refining |
4.Extraction of Au |
|
5.Purification of Ni |
A
|
B
|
C
|
D
|
A
|
B
|
C
|
D
|
A
|
B
|
C
|
D
|
A
|
B
|
C
|
D
|
D.
A
|
B
|
C
|
D
|
Cyanide process is used for extracting Au (gold) from low-grade ore by converting the Au to the water soluble coordination complex.
Froth flotation process is used for the dressing of sulphide ore such ZnS.
Electrolytic reduction is used for the extraction of Al. The extraction of aluminium is carried out in a steel tank lined inside with graphite. Here graphite used serves as a cathode.
Zone refining is used for ultra pure Ge element. An ingot of Ge is first purified by zone refining. Then a small amount of antimony is placed in the molten zone which is passed through the pure Ge with the proper choice of rate of heating and other variables.