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Chapters
2: p-Block Elements - I
3: p-Block Elements - II
4: Transition and Inner Transition Elements
5: Coordination Chemistry
6: Solid State
7: Chemical Kinetics
8: Ionic Equilibrium
9: Electro Chemistry
10: Surface Chemistry
11: Hydroxy Compounds and Ethers
12: Carbonyl Compounds and Carboxylic Acids
13: Organic Nitrogen Compounds
14: Biomolecules
15: Chemistry in Everyday Life
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Solutions for Chapter 1: Metallurgy
Below listed, you can find solutions for Chapter 1 of Tamil Nadu Board of Secondary Education Samacheer Kalvi for Chemistry - Volume 1 and 2 [English] Class 12 TN Board.
Samacheer Kalvi solutions for Chemistry - Volume 1 and 2 [English] Class 12 TN Board 1 Metallurgy Evaluation [Pages 20 - 24]
Choose the correct answer:
Bauxite has the composition
\[\ce{Al2O3}\]
\[\ce{Al2O3.{n}H2O}\]
\[\ce{Fe2O3.2H2O}\]
None of these
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
Which one of the following reaction represents calcinations?
\[\ce{2Zn + O2 -> 2ZnO}\]
\[\ce{2ZnS + 3O2 -> 2ZnO + 2SO2}\]
\[\ce{MgCO3 -> MgO + CO2}\]
Both \[\ce{2Zn + O2 -> 2ZnO}\] and \[\ce{MgCO3 -> MgO + CO2}\]
The metal oxide which cannot be reduced to metal by carbon is ____________.
PbO
Al2O3
ZnO
FeO
Which of the metal is extracted by the Hall-Heroult process?
Al
Ni
Cu
Zn
Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?
`Δ"G"_"f"^0` of sulphide is greater than those for CS2 and HS2.
`Δ"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.
Match items in Column – I with the items of Column – II and assign the correct code.
| Column – I | Column – II |
| A. Cyanide process | (i) Ultrapure Ge |
| B. Froth floatation process | (ii) Dressing of ZnS |
| C. Electrolytic reduction | (iii) Extraction of Al |
| D. Zone refining | (iv) Extraction of Au |
| (v) Purification of Ni |
A - (i), B - (ii), C - (iii), C - (iv)
A - (iii), B - (iv), C - (v), C - (i)
A - (iv), B - (ii), C - (iii), C - (i)
A - (ii), B - (iii), C - (i), C - (v)
Wolframite ore is separated from tinstone by the process of ____________.
Smelting
Calcination
Roasting
Electromagnetic separation
Which one of the following is not feasible
\[\ce{Zn_{(s)} + Cu^{2+}_{ (aq)} -> Cu_{(s)} + Zn^{2+}_{ (aq)}}\]
\[\ce{Cu_{(s)} + Zn^{2+}_{ (aq)} -> Zn_{(s)} + Cu^{2+}_{ (aq)}}\]
\[\ce{Cu_{(s)} + 2Ag^+_{ (aq)} -> 2Ag_{(s)} + Cu^{2+}_{ (aq)}}\]
\[\ce{Fe_{(s)} + Cu^2_{ (aq)} -> Cu_{(s)} + Fe^{2+}_{ (aq)}}\]
Electrochemical process is used to extract ____________.
Iron
Lead
Sodium
Silver
Flux is a substance which is used to convert
Mineral into silicate
Infusible impurities to soluble impurities
Soluble impurities to infusible impurities
All of these
Which one of the following ores is best concentrated by the froth floatation method?
Magnetite
Haematite
Galena
Cassiterite
In the extraction of aluminium from alumina by electrolysis, cryolite is added to
Lower the melting point of alumina
Remove impurities from alumina
Decrease the electrical conductivity
Increase the rate of reduction
Zinc is obtained from ZnO by ____________.
Carbon reduction
Reduction using silver
Electrochemical process
Acid leaching
Extraction of gold and silver involves leaching with cyanide ion. silver is later recovered by
Distillation
Zone refining
Displacement with zinc
liquation
Considering the Ellingham diagram, which of the following metals can be used to reduce alumina?
Fe
Cu
Mg
Zn
The following set of reactions are used in refining Zirconium
\[\ce{Zr (impure) + 2I2 ->[523 K] ZrI4}\]
\[\ce{ZrI4 ->[1800 K] Zr (pure) + 2I2}\]
This method is known as
Liquation
Van Arkel process
Zone refining
Mond’s process
Which of the following is used for concentrating ore in metallurgy?
Leaching
Roasting
Froth floatation
Both Leaching and Froth floatation
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
In the electrolytic refining of copper, which one of the following is used as anode?
Pure copper
Impure copper
Carbon rod
Platinum electrode
Which of the following plot gives Ellingham diagram
ΔS Vs T
ΔG0 Vs T
ΔG0 Vs `1/"T"`
ΔG0 Vs T2
In the Ellingham diagram, for the formation of carbon monoxide
`((Δ"S"^0)/(Δ"T"))` is negative
`((Δ"G"^0)/(Δ"T"))` is positive
`((Δ"G"^0)/(Δ"T"))` is negative
initially `((Δ"T")/(Δ"G"^0))` is positive, after 700°C, `((Δ"G"^0)/(Δ"T"))` is negative
Which of the following reduction is not thermodynamically feasible?
\[\ce{Cr2O3 + 2Al -> Al2O3 + 2Cr}\]
\[\ce{Al2O3 + 2Cr -> Cr2O3 + 2Al}\]
\[\ce{3TiO2 + 4Al -> 2Al2O3 + 3Ti}\]
None of these
Which of the following is not true with respect to the 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.
Answer the following questions:
What are the differences between minerals and ores?
What are the various steps involved in the extraction of pure metals from their ores?
What is the role of Limestone in the extraction of iron from its oxide Fe2O3?
Which type of ores can be concentrated by the froth floatation method? Give two examples for such ores.
Describe a method for refining nickel.
Explain the zone refining process with an example.
Using the Ellingham diagram,
(A) Predict the conditions under which
- Aluminium might be expected to reduce magnesia.
- Magnesium could reduce alumina.
(B) it is possible to reduce Fe2O3 by coke at a temperature around 1200 K
Give the uses of zinc.
Explain the electrometallurgy of aluminium.
Explain the following term with a suitable example.
Gangue
Explain the following term with a suitable example.
Slag
Give the basic requirement for vapour phase refining.
Describe the role of the following in the process mentioned.
Silica in the extraction of copper.
Describe the role of the following in the process mentioned.
Cryolite in the extraction of aluminium.
Describe the role of the following in the process mentioned.
Iodine in the refining of Zirconium.
Describe the role of the following in the process mentioned.
Sodium cyanide in froth floatation.
Explain the principle of electrolytic refining with an example.
The selection of reducing agent depends on the thermodynamic factor: Explain with an example.
Give the limitations of the Ellingham diagram.
Write a short note on electrochemical principles of metallurgy.
Solutions for 1: Metallurgy
Samacheer Kalvi solutions for Chemistry - Volume 1 and 2 [English] Class 12 TN Board chapter 1 - Metallurgy
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Concepts covered in Chemistry - Volume 1 and 2 [English] Class 12 TN Board chapter 1 Metallurgy are Occurrence of Metals, Concentration of Ores, Extraction of Crude Metal from Concentrated Ore, Thermodynamic Principles of Metallurgy, Electrochemical Principles of Metallurgy, Refining Process, Applications of Metals.
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