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Published on: 23/08/2019
Metallurgy
Download Tamil Nadu 12th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
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1.
In Hall-Heroult process ___________act as an anode.
Carbon blocks
hydrogen
copper rods
Zinc rods
2.
A mixture containing sulphides of copper and iron is called______
mineral
ore
matte
matrix
3.
In the metallurgy of iron, limestone is added to coke. Which acts as a_______
Reducing agent
Oxidising agent
Slag
Flux
4.
Semiconductors are purified by_______ method.
Zone refining
Electrolytic refining
Mond's process
Bessemerisation
5.
Na[Ag(CN)2] is _________.
Sodium aurocyanide
Sodium meta aluminate
Aluminosilicate
Sodium dicyanoargentate
6.
The process of heating of copper pyrites to remove sulphur is called ________.
froth flotation
roasting
calcination
smelling
7.
Identify the decreasing order of carbon content in different forms of iron________.
Wrought iron > Pig iron > cast iron
Cast iron > Pig iron > Wrought iron
Pig iron > Cast iron > Wrought iron
Cast iron > Wrought iron > Pig iron
8.
Which of the following mineral contains calcium as well as magnesium?
Zinc blende
Aragonite
Dolomite
Carnallite
9.
Among the following, one does not belong to calcination, Pick the odd one out.
\({ PBCO }_{ 3 }\overset { \Delta }{ \longrightarrow } PBO+{ CO }_{ 2 }\uparrow \)
\({ CaCo }_{ 3 }\overset { \Delta }{ \longrightarrow } Cao+{ CO }_{ 2 }\uparrow \)
\(PbS{ O }_{ 3 }\overset { \Delta }{ \rightarrow } PbO+{ 2SO }_{ 2 }\uparrow \)
\({ ZnCO }_{ 3 }\overset { \Delta }{ \rightarrow } ZnO+{ CO }_{ 2 }\uparrow \)
10.
Which of the following is not true with respect to Ellingham diagram?
Free energy changes follow a straight line. Deviation occurs when there is a phase change.
The graph for the formation of CO2 is a straight line almost parallel to free energy axis.
Negative slope of CO shows that it becomes more stable with increase in temperature.
Positive slope of metal oxides shows that their stabilities decrease with increase in temperature.
11.
Which of the following is used for concentrating ore in metallurgy?
Leaching
Roasting
Froth floatation
Both (a) and (c)
12.
Zinc is obtained from ZnO by________.
Carbon reduction
Reduction using silver
Electrochemical process
Acid leaching
13.
Electrochemical process is used to extract_______.
Iron
Lead
Sodium
silver
14.
Which of the metal is extracted by Hall-Heroult process?
Al
Ni
Cu
Zn
15.
Bauxite has the composition ______.
Al2O3
Al2O3.nH2O
Fe2O3.2H2O
None of these
16.
Electrolytic refining
17.
Mond's process
18.
Liquation
19.
Sulphate ore
20.
Froth floatation
21.
Gravity separation
22.
Cerussite
23.
Azurite
24.
Cuprite
25.
Malachite
1.
(a)
Carbon blocks
2.
(c)
matte
3.
(d)
Flux
4.
(a)
Zone refining
5.
(d)
Sodium dicyanoargentate
6.
(b)
roasting
7.
(c)
Pig iron > Cast iron > Wrought iron
8.
(c)
Dolomite
9.
(c)
\(PbS{ O }_{ 3 }\overset { \Delta }{ \rightarrow } PbO+{ 2SO }_{ 2 }\uparrow \)
10.
(b)
The graph for the formation of CO2 is a straight line almost parallel to free energy axis.
11.
(d)
Both (a) and (c)
12.
(a)
Carbon reduction
13.
(c)
Sodium
14.
(a)
Al
15.
(b)
Al2O3.nH2O
16.
Copper
17.
Nickel
18.
Tin
19.
Anglesite
20.
Zinc Blende
21.
Haematite
22.
Pb
23.
Cu
24.
Cu2O
25.
CuCO3CU(OH)2
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