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Published on: 29/08/2019
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.
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 : \({ Fe }_{ 2 }{ O }_{ 3 }3C\rightarrow 3CO+2Fe\)
2.
Among the following, one does not belong to calcination, Pick the odd one out.
\({ PBCO }_{ 3 }\overset { \Delta }{ \longrightarrow } PBO+{ CO }_{ 2 }\uparrow \)
\({ CaCo }_{ 3 }\overset { \Delta }{ \longrightarrow } Cao+{ CO }_{ 2 }\uparrow \)
\(PbS{ O }_{ 3 }\overset { \Delta }{ \rightarrow } PbO+{ 2SO }_{ 2 }\uparrow \)
\({ ZnCO }_{ 3 }\overset { \Delta }{ \rightarrow } ZnO+{ CO }_{ 2 }\uparrow \)
3.
Which of the following is commonly used to produce foam in froth floatation process?
Pine oil
Cresol
NaCN
Xanthate
4.
Which of the metal is extracted by Hall-Heroult process?
Al
Ni
Cu
Zn
5.
Bauxite has the composition ______.
Al2O3
Al2O3.nH2O
Fe2O3.2H2O
None of these
6.
Limonite
7.
Azurite
8.
Calamine
9.
Cuprite
10.
Azurite
1.
(b)
Zone of heat absorption : \({ CO }_{ 2 }\rightarrow C+{ O }_{ 2 }\)
2.
(c)
\(PbS{ O }_{ 3 }\overset { \Delta }{ \rightarrow } PbO+{ 2SO }_{ 2 }\uparrow \)
3.
(a)
Pine oil
4.
(a)
Al
5.
(b)
Al2O3.nH2O
6.
Fe
7.
Cu
8.
Zn
9.
Cu2O
10.
2CuCO3.Cu(OH)2
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