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Published on: 27/06/2019
Chapter one multiple choice creative questions
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.
The process of heating of copper pyrites to remove sulphur is called ________.
froth flotation
roasting
calcination
smelling
2.
\(2PbS+{ 3O }_{ 2 }\longrightarrow 2pbO+{ 2SO }_{ 2 }\) Name the process ________.
Roasting
Calcination
Smelting
Leaching
3.
Identify the metal that occurs in free state.
Al
Au
Mg
Ca
4.
Identify the halide ore among the following
Epsom Salt
Pyrolusite
Anglesite
Rock Salt
5.
The blistered appearance of Cu obtained from the reverberatory furnace is due to evolution of________.
CO2 gas
SO2 gas
NO2
Due to evaporation of volatile materials
6.
Sodium magnesium and aluminum can be obtained from their ore by________.
electro metallurgy
pyro metallurgy
hydro metallurgy
smelting
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.
Concentration of copper glance is done by________.
leaching
magnetic separation
froth flotation
hydraulic washing
9.
In the froth-floatation process the collectors such as pine oil and xanthates, etc enhance.
Non-wettability of the mineral particles in froth.
Non-wettability of the mineral particles in water
Non-wettability of the gangue particles in froth
Non-wettability of the gangue particles in water
10.
Which of the following mineral contains calcium as well as magnesium?
Zinc blende
Aragonite
Dolomite
Carnallite
11.
Which one of the following element is present as a impurity in pig iron?
Phosphorus
Manganese
Carbon
Silicon
12.
Which among the following reaction represents the formation of slag?
\(Ca{ O }_{ (s) }+{ SiO }_{ 2(s) }\longrightarrow { CaSiO }_{ 3(s) }\)
\({ 2C }_{ (s) }+{ O }_{ 2(g) }\longrightarrow { 2CO }_{ (g) }\)
\({ Fe }_{ 2 }{ O }_{ 3 }+{ 3CO }_{ (g) }\longrightarrow 2{ Fe }_{ (g) }+{ 3CO }_{ 2(g) }\)
\({ CaCO }_{ 3(g) }\longrightarrow { CaO }_{ (s) }+{ CO }_{ 2(g) }\)
13.
Which of the following will give respective metal by self reduction?
Galena (Pbs)
HgS
ZnS
Both (a) & (b)
14.
Name the process by which elements such as germanium, silicon and gallium are refined.
Vapour phase method
Electrolytic refining
Zone refining
Van-Arkel method
15.
Which of the following is incorrect with respect to metallurgy of iron in the blast furnace?
Zone of combustion : \(C+{ O }_{ 2 }\rightarrow { CO }_{ 2 }\)
Zone of heat absorption : \({ CO }_{ 2 }\rightarrow C+{ O }_{ 2 }\)
Zone of slag formation : \(CaO+{ SiO }_{ 2 }\rightarrow CaSiO_{ 3 }\)
Zone of reduction : \({ Fe }_{ 2 }{ O }_{ 3 }3C\rightarrow 3CO+2Fe\)
16.
Among the following, one does not belong to calcination, Pick the odd one out.
\({ PBCO }_{ 3 }\overset { \Delta }{ \longrightarrow } PBO+{ CO }_{ 2 }\uparrow \)
\({ CaCo }_{ 3 }\overset { \Delta }{ \longrightarrow } Cao+{ CO }_{ 2 }\uparrow \)
\(PbS{ O }_{ 3 }\overset { \Delta }{ \rightarrow } PbO+{ 2SO }_{ 2 }\uparrow \)
\({ ZnCO }_{ 3 }\overset { \Delta }{ \rightarrow } ZnO+{ CO }_{ 2 }\uparrow \)
17.
Which of the following is commonly used to produce foam in froth floatation process?
Pine oil
Cresol
NaCN
Xanthate
18.
Which of the following is not a mineral of aluminium?
Bauxite
Cryolite
China clay
Malachite
19.
Which metal is used for extraction of Au and Ag and also for galvanisation of iron objects?
Mg
Zn
Cr
Co
1.
(b)
roasting
2.
(a)
Roasting
3.
(b)
Au
4.
(d)
Rock Salt
5.
(b)
SO2 gas
6.
(a)
electro metallurgy
7.
(c)
Pig iron > Cast iron > Wrought iron
8.
(c)
froth flotation
9.
(b)
Non-wettability of the mineral particles in water
10.
(c)
Dolomite
11.
(c)
Carbon
12.
(a)
\(Ca{ O }_{ (s) }+{ SiO }_{ 2(s) }\longrightarrow { CaSiO }_{ 3(s) }\)
13.
(d)
Both (a) & (b)
14.
(c)
Zone refining
15.
(b)
Zone of heat absorption : \({ CO }_{ 2 }\rightarrow C+{ O }_{ 2 }\)
16.
(c)
\(PbS{ O }_{ 3 }\overset { \Delta }{ \rightarrow } PbO+{ 2SO }_{ 2 }\uparrow \)
17.
(a)
Pine oil
18.
(d)
Malachite
19.
(b)
Zn
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