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Published on: 13/10/2020
12th Standard Chemistry Metallurgy English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021
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.
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1.
In Hall-Heroult process ___________act as an anode.
Carbon blocks
hydrogen
copper rods
Zinc rods
2.
Sodium cyanide solution is used to extract _________from its ores
copper
silver
gold
both (b) and (c)
3.
A mixture containing sulphides of copper and iron is called______
mineral
ore
matte
matrix
4.
Na[Ag(CN)2] is _________.
Sodium aurocyanide
Sodium meta aluminate
Aluminosilicate
Sodium dicyanoargentate
5.
In acid leaching process the insoluble sulphide is converted into soluble sulphate and elemental_______.
carbon
lead
sulphur
zinc
6.
Pick out the alloy that contains a non-metal as a constituent in it ________.
Brass
Bronze
Steel
Invar
7.
The process of heating of copper pyrites to remove sulphur is called ________.
froth flotation
roasting
calcination
smelling
8.
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
9.
Which one of the following element is present as a impurity in pig iron?
Phosphorus
Manganese
Carbon
Silicon
10.
Among the following, one does not belong to calcination, Pick the odd one out.
\({ PBCO }_{ 3 }\overset { \Delta }{ \longrightarrow } PBO+{ CO }_{ 2 }\uparrow \)
\({ CaCo }_{ 3 }\overset { \Delta }{ \longrightarrow } Cao+{ CO }_{ 2 }\uparrow \)
\(PbS{ O }_{ 3 }\overset { \Delta }{ \rightarrow } PbO+{ 2SO }_{ 2 }\uparrow \)
\({ ZnCO }_{ 3 }\overset { \Delta }{ \rightarrow } ZnO+{ CO }_{ 2 }\uparrow \)
11.
Which of the following reduction is not thermodynamically feasible?
\({ Cr }_{ 2 }{ O }_{ 3 }+2Al\longrightarrow { Al }_{ 2 }{ O }_{ 3 }+2Cr\)
\(\mathrm{Al}_2 \mathrm{O}_3+2 \mathrm{Cr} \longrightarrow \mathrm{Cr}_2 \mathrm{O}_3+2 \mathrm{Al}\)
\(3Ti{ O }_{ 2 }+4Al\longrightarrow 2A{ l }_{ 2 }{ O }_{ 3 }+3Ti\)
none of these
12.
The incorrect statement among the following is______.
Nickel is refined by Mond’s process
Titanium is refined by Van Arkel’s process
Zinc blende is concentrated by froth floatation
In the metallurgy of gold, the metal is leached with dilute sodium chloride solution
13.
The following set of reactions are used in refining Zirconium
\(Zr \text{(impure)}+2I_{ 2 }\overset { 523k }{ \longrightarrow } ZrI_{ 4 }\)
\({ ZrI }_{ 4 }\overset { 1800K }{ \longrightarrow } Zr \text{(pure)}+{ 2I }_{ 2 }\)This method is known as ______.
Liquation
Van Arkel process
Zone refining
Mond’s process
14.
Zinc is obtained from ZnO by________.
Carbon reduction
Reduction using silver
Electrochemical process
Acid leaching
15.
Which one of the following ores is best concentrated by froth – floatation method?
Magnetite
Haematite
Galena
Cassiterite
16.
Electrochemical process is used to extract_______.
Iron
Lead
Sodium
silver
17.
Wolframite ore is separated from tinstone by the process of________.
Smelting
Calcination
Roasting
Electromagnetic separation
18.
Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?
\(\Delta { G }_{ f }^{ 0 }\) of sulphide is greater than those for CS2 and H2S
\(\Delta { G }_{ r }^{ 0 }\) is negative for roasting of sulphide ore to oxide
Roasting of the sulphide to its oxide is thermodynamically feasible
Carbon and hydrogen are suitable reducing agents for metal sulphides
19.
Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is______.
CO2
SO3
SO2
H2S
1.
(a)
Carbon blocks
2.
(d)
both (b) and (c)
3.
(c)
matte
4.
(d)
Sodium dicyanoargentate
5.
(c)
sulphur
6.
(c)
Steel
7.
(b)
roasting
8.
(c)
Pig iron > Cast iron > Wrought iron
9.
(c)
Carbon
10.
(c)
\(PbS{ O }_{ 3 }\overset { \Delta }{ \rightarrow } PbO+{ 2SO }_{ 2 }\uparrow \)
11.
(b)
\(\mathrm{Al}_2 \mathrm{O}_3+2 \mathrm{Cr} \longrightarrow \mathrm{Cr}_2 \mathrm{O}_3+2 \mathrm{Al}\)
12.
(d)
In the metallurgy of gold, the metal is leached with dilute sodium chloride solution
13.
(b)
Van Arkel process
14.
(a)
Carbon reduction
15.
(c)
Galena
16.
(c)
Sodium
17.
(d)
Electromagnetic separation
18.
(d)
Carbon and hydrogen are suitable reducing agents for metal sulphides
19.
(c)
SO2
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