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Published on: 23/08/2022
QB365 provides a detailed and simple solution for every Creative Questions in Class 12 Chemistry Subject. It will help to get more ideas about question patterns in every Creative Questions with Solution.
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1.
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
2.
Concentration of copper glance is done by________.
leaching
magnetic separation
froth flotation
hydraulic washing
3.
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
4.
Which of the following mineral contains calcium as well as magnesium?
Zinc blende
Aragonite
Dolomite
Carnallite
5.
Which one of the following element is present as a impurity in pig iron?
Phosphorus
Manganese
Carbon
Silicon
6.
Which among the following reaction represents the formation of slag?
\(Ca{ O }_{ (s) }+{ SiO }_{ 2(s) }\longrightarrow { CaSiO }_{ 3(s) }\)
\({ 2C }_{ (s) }+{ O }_{ 2(g) }\longrightarrow { 2CO }_{ (g) }\)
\({ Fe }_{ 2 }{ O }_{ 3 }+{ 3CO }_{ (g) }\longrightarrow 2{ Fe }_{ (g) }+{ 3CO }_{ 2(g) }\)
\({ CaCO }_{ 3(g) }\longrightarrow { CaO }_{ (s) }+{ CO }_{ 2(g) }\)
7.
Which of the following will give respective metal by self reduction?
Galena (Pbs)
HgS
ZnS
Both (a) & (b)
8.
Name the process by which elements such as germanium, silicon and gallium are refined.
Vapour phase method
Electrolytic refining
Zone refining
Van-Arkel method
9.
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 : \({ Fe }_{ 2 }{ O }_{ 3 }3C\rightarrow 3CO+2Fe\)
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 is commonly used to produce foam in froth floatation process?
Pine oil
Cresol
NaCN
Xanthate
12.
Which of the following is not a mineral of aluminium?
Bauxite
Cryolite
China clay
Malachite
13.
Which metal is used for extraction of Au and Ag and also for galvanisation of iron objects?
Mg
Zn
Cr
Co
14.
Cupellation is a process used for the refining of________.
Silver
Lead
Copper
iron
1.
(c)
Pig iron > Cast iron > Wrought iron
2.
(c)
froth flotation
3.
(b)
Non-wettability of the mineral particles in water
4.
(c)
Dolomite
5.
(c)
Carbon
6.
(a)
\(Ca{ O }_{ (s) }+{ SiO }_{ 2(s) }\longrightarrow { CaSiO }_{ 3(s) }\)
7.
(d)
Both (a) & (b)
8.
(c)
Zone refining
9.
(b)
Zone of heat absorption : \({ CO }_{ 2 }\rightarrow C+{ O }_{ 2 }\)
10.
(c)
\(PbS{ O }_{ 3 }\overset { \Delta }{ \rightarrow } PbO+{ 2SO }_{ 2 }\uparrow \)
11.
(a)
Pine oil
12.
(d)
Malachite
13.
(b)
Zn
14.
(a)
Silver
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