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Chapters
1: Solid State
2: Solutions
3: Electrochemistry
4: Chemical Kinetics
5: Surface Chemistry
Inorganic Chemistry
▶ 6: General Principles and Processes of Isolation of Elements
7: p-Block Elements
8: d-and ƒ-Block Elements
9: Coordination Compounds
Organic Chemistry
10: Haloalkanes and Haloarenes
Chapter 11: Alcohols, Phenols and Ethers
Chapter 12: Aldehydes, Ketones and Carboxylic Acids
Chapter 13: Organic Compounds containing Nitrogen
Chapter 14: Biomolecules
15: Polymers
Chapter 16: Chemistry in Everyday Life
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Solutions for Chapter 6: General Principles and Processes of Isolation of Elements
Below listed, you can find solutions for Chapter 6 of CISCE Nootan for Chemistry Part 1 and 2 [English] Class 12 ISC.
Nootan solutions for Chemistry Part 1 and 2 [English] Class 12 ISC 6 General Principles and Processes of Isolation of Elements REVIEW EXERCISES [Pages 333 - 354]
How do elements occur in nature?
What is the difference between minerals and ores?
How can the ores be classified? Give at least one example of each type of ore.
Which metal is extracted from bauxite ore?
Name the elements which are extracted from the following ore:
Zinc blende
Name the metal which is extracted from haematite ore.
Name the elements which are extracted from the following ore.
Malachite
How does the following element occur in living systems?
Iron
How does the following elements occur in living systems?
Iodine
How does the following element occur in living system?
Zinc
How does the following element occur in living system?
Carbon
Name some important metals whose ores are abundant in India.
To which groups of the periodic table do zinc and silver belong?
Name the important ores of zinc.
Describe vertical retort process used for the extraction of zinc.
How is crude zinc purified?
Mention the important uses of zinc and its alloys.
In what forms does silver occur in nature?
Give the names and formulae of important ores of silver.
Describe the principle involved in the cyanide process used for the extraction of silver.
Describe the principle involved in the Parke’s process used for the extraction of silver.
What is cupellation process?
For what cupellation process is used?
Describe the process of cupellation process.
What happens when silver is treated with conc. HNO3?
What happens when silver is treated with conc. H2SO4?
What happens when silver is treated with Aq. KCN solution?
What happens when silver is treated with sulphur?
How is the purity of silver expressed?
What is meantby ‘930 fine silver?
Give the composition and uses of the following alloy:
Dental amalgam
Give the composition and uses of the following alloy:
Coinage alloy
Give the composition and uses of the following alloy:
Palladium silver alloy
Explain the principle of coupling in metallurgical operations.
What is Ellingham diagram and how is it useful in metallurgical processes?
What is pyrometallurgy?
Give an example of pyrometallurgy.
List the reactions that take place in a blast furnace in the metallurgy of iron.
Write a short note on electrochemical principles of metallurgy.
What is the chief ore of iron?
Write chemical reactions taking place in the extraction of iron from its ore.
Name the principal ore of aluminium.
Describe the leaching of aluminium ore.
What do you understand by the beneficiation of the ore?
What is levigation and how is it carried out?
What type of ores are concentrated by magnetic separation techinique?
What is the role of collectors in froth floatation process?
What is the difference between calcination and roasting?
What flux would you use to remove the following impurity?
SiO2
What flux would you use to remove the following impurity?
P2O5
What flux would you use to remove the following impurity?
FeO
What flux would you use to remove the following impurity?
CaO
Why is molten metal stirred with the logs of green wood in poling?
Which state in India is the richest in minerals?
Nootan solutions for Chemistry Part 1 and 2 [English] Class 12 ISC 6 General Principles and Processes of Isolation of Elements VERY SHORT ANSWER TYPE QUESTIONS [Pages 355 - 356]
What are minerals?
What is the difference between minerals and ores?
What do you understand by the term ‘metallurgy’?
What process is used for the concentration of haematite ore?
What is the role of ethyl xanthate in froth floatation process?
What do you understand by the terms flux?
What do you understand by the term slag?
Why are the logs of green wood used in poling for the refining of certain metals?
Which part of the country is the richest in minerals?
Which metal is extracted from bauxite ore?
Name the metal which form following ore:
Galena
Name the metal which form following ore:
Gypsum
Which metal can be extracted from the following ore?
Calamine
What type of ores are usually calcined?
Name the furnace usually used for the roasting of ores.
Define smelting.
Which substance is usually used as flux when the ore contains the impurities of silica?
Name the process involving the reduction of the roasted ore with aluminium.
Which metallurgical process is involved in the metallurgy of copper?
Which process is used to obtain silicon of very high degree of purity?
Which is a better reducing agent at 710°C, C or CO?
Indicate the temperature at which carbon can be used as a reducing agent for FeO.
Is it true that under certain conditions Mg can reduce SiO2 and Si can reduce MgO?
Name the most important ore of iron.
Nootan solutions for Chemistry Part 1 and 2 [English] Class 12 ISC 6 General Principles and Processes of Isolation of Elements SHORT ANSWER TYPE QUESTIONS [Page 356]
How do elements occur in nature?
How can the ores be classified? Give at least one example of each type of ore.
What is froth floatation process?
On what principle froth floatation process is based?
Distinguish between calcination and roasting. Illustrate your answer with examples.
What is the role of a flux in carbon reduction process?
How is a particular flux chosen for a particular metallurgical process?
What is hydrometallurgy?
How hydrometallurgy is useful in the extraction of silver and gold?
Write short notes on levigation.
Write short notes on aluminothermic process.
Write short notes on cupellation.
Explain the difference between leaching and levigation.
Name the three elements which occur in nature both in the free state as well as in the combined state.
Comment on the statement that - “All ores are minerals but all minerals are not ores”.
Give a brief account of the gravity separation process used for the concentration of ores.
What type of ores are concentrated by magnetic separation techinique?
What is the role of activators in the froth floatation process?
What is the role of depressant in froth floatation process?
Name the process used for the concentration of bauxite ore. Give a brief account of the process.
Why is the concentrated ore usually converted into its oxidised form?
What are the processes used for the purpose of conversion of concentrated ore into its oxidised form?
Define roasting.
What changes do take place when a concentrated ore is subjected to roasting?
What do you understand by smelting?
Describe the role of flux in smelting process.
Describe briefly the Goldschmidt aluminothermic process.
What is electrolytic reduction and for what type of metals is it used? Give an example.
What type of metals can be purified by liquation technique? Describe the technique.
What is poling?
What is the role of logs of green wood in poling process?
Describe zone refining method used to obtain metals of high degree purity.
Giving a suitable example, describe Van Arkel method for the purification of metals.
Copper and silver are below hydrogen in electrochemical series and yet they are found in the combined state as sulphides in nature. Comment.
Name the main form of occurrence of the following in the earth’s crust:
Aluminium
Name the main form of occurrence of the following in the earth’s crust:
Iron
Name the main form of occurrence of the following in the earth’s crust:
Zinc
Name the main form of occurrence of the following in the earth’s crust:
Copper
The choice of a reducing agent in a particular case depends on thermodynamic factor. How far do you agree with this statement? Support your opinion with two examples.
Predict the mode of occurrence of the following type of metal:
Highly reactive (e.g., Na)
Predict the mode of occurrence of the following type of metal:
Moderately reactive (e.g., Fe)
Predict the mode of occurrence of the following type of metal:
Noble metal (e.g., Au)
Which type of ores can be concentrated by the froth floatation method? Give two examples for such ores.
What is meant by a depressant?
What is the thermodynamic consideration in the choice of a reducing agent in metallurgy?
Carbon monoxide is a more effective reducing agent than carbon below 983 K but above this temperature the reverse is true. Explain.
Which metals are generally extracted by the electrolytic process? What positions do these metals generally occupy in the periodic table?
Name the metal which is associated with the following term in the extraction from its ores.
Bessemer converter
Name the metal which is associated with the following term in the extraction from its ores.
Blast furnace
Name the metal which is associated with the following term in the extraction from its ores.
Aluminothermic process
Name the metal which is associated with the following term in the extraction from its ores.
Magnetic separation
Which method would you suggest for the separation of the metal in the following mixture?
Zinc and iron
Give reasons for your choice.
Which method would you suggest for the separation of the metal in the following mixture?
Copper and magnesium
Give reasons for your choice.
Which method would you suggest for the separation of the metal in the following mixture?
Rare earths
Give reasons for your choice.
Nootan solutions for Chemistry Part 1 and 2 [English] Class 12 ISC 6 General Principles and Processes of Isolation of Elements LONG ANSWER TYPE QUESTIONS [Page 357]
How do elements occur in nature?
How can the ores be classified? Give at least one example of each type of ore.
Give an account of some common ores and their occurrence in India.
Discuss the various processes used for the concentration of different types of ores.
Discuss various techniques used for the production of a metal from the concentrated ore.
Describe various processes used for the refining of a crude metal.
On what principle froth floatation process is based?
What is the role of a stabiliser in froth floatation process?
What is the role of depressant in froth floatation process?
Give one example of stabiliser in froth floatation process.
Give one example of depressant in froth floatation process.
Explain the principle of electrolytic refining with an example.
What is the principle behind the zone refining of metals?
Describe the principle of the following process in detail.
Chromatographic refining
You are provided with samples of some impure metals such as zinc, copper and germanium. Describe the methods you recommend for the purification of each of these metals.
Describe the factors which are necessary to be considered before deciding on the method of extraction of a metal from its ore.
Giving suitable examples, explain how the reactivity of a metal is related to its mode of occurrence in nature.
How do non-metals occur in nature and how are they extracted/isolated from their natural sources?
Name the important ores of zinc. What methods are employed for the concentration of the ores?
Name the important ores of iron. What methods are employed for the concentration of the ores?
Name the important ores of aluminium. What methods are employed for the concentration of the ores?
Write short notes on the following:
Roasting
Write short note on the following:
Calcination
Write short note on the following:
Smelting
What are thermodynamic principles of metallurgy? Explain with a suitable example.
What is Ellingham diagram and how is it useful in metallurgical processes?
How is iron extracted from its ores?
State two important uses of following metals:
Uses of iron
How is copper extracted from its ores?
State two important uses of following metal.
Uses of copper
How is zinc extracted from zinc oxide?
State two important uses of following metal:
Uses of zinc
What are electrochemical principles of metallurgy? Explain with a suitable example.
How is aluminium extracted from its ores?
State two important uses of following metal:
Uses of aluminium
How are non-metals extracted by oxidation? Give an example.
Nootan solutions for Chemistry Part 1 and 2 [English] Class 12 ISC 6 General Principles and Processes of Isolation of Elements OBJECTIVE (MULTIPLE CHOICE) TYPE QUESTIONS [Pages 357 - 360]
Choose the correct option in the following questions.
A naturally occurring substance from which a metal can be profitably extracted is known as ______.
mineral
gangue
ore
flux
The most abundant element in earth’s crust is ______.
hydrogen
oxygen
silicon
carbon
Which of the following is not an ore?
Bauxite
Malachite
Zinc blende
Pig iron
In the froth floatation process for the purification of ores, the ore particles float because ______.
they are light.
their surface is hydrophobic, i.e., not easily wetted by water.
they bear electrostatic charge.
they are insoluble.
Which of the following processes involve smelting?
\[\ce{ZnCO3 -> ZnO + CO2}\]
\[\ce{Fe2O3 + 3C -> 2Fe + 3CO}\]
\[\ce{2PbS + 3O2 -> 2PbO + 2SO2}\]
\[\ce{Al2O3 * 2H2O -> Al2O3 + 2H2O}\]
A substance which reacts with gangue to form fusible material is called ______.
flux
catalyst
ore
slag
Which of the following metals is obtained by leaching its ore with dilute cyanide solution?
Silver
Titanium
Vanadium
Zinc
Which method of purification is represented by the following equation?
\[\ce{Ti + 2I2 ->[773 K] Til4 ->[1675 K] Ti + 2I2}\]
Cupellation
Poling
Van Arkel
Zone refining
Bauxite, an ore of aluminium, is ______.
a sulphide ore
carbonate ore
an oxide ore
a halide ore
Which of the following statements is (are) correct?
Levigation is generally used for the extraction of oxide ores.
Haematite is usually concentrated by froth floatation process.
Ethyl xanthate used in froth floatation process acts as a frothing agent.
Leaching is a chemical method.
Which of the following process does not involve calcination?
\[\ce{CaCO3 -> CaO + CO2}\]
\[\ce{2FeS + 3O2 -> Fe2O3 + 2SO2}\]
\[\ce{Fe2O3 * 3H2O -> Fe2O3 + 3H2O}\]
\[\ce{CuCO3 * Cu(OH)2 -> 2CuO + H2O + CO2}\]
Which of the following metals is (are) obtained by leaching its (their) ore(s) with dilute cyanide solution?
Zinc
Aluminium
Silver
Gold
The ore of a metal contains P2O5 as impurity. The suitable flux for the ore is ______.
SiO2
CaO
B2O3
PbO
Which of the following ores is (are) roasted to produce metals?
Bauxite
Copper pyrites
Iron pyrites
Horn silver
Froth floatation process is used for the concentration of ______.
sulphide ores
oxide ores
carbonate ores
silicate ores
In zone refining method, the molten zone consists of ______.
impurities only
pure metal only
a higher percentage of metal
a higher percentage of impurities
The process of reducing the roasted ore with aluminium powder is called ______.
aluminothermic process
cyanide process
leaching
electrolytic reduction
The roasted sulphide ore of Cu contains ______.
Cu2O only
Cu2S only
both Cu2O and Cu2S
metallic copper
Which of the following metals can be purified by liquation method?
Sn
Hg
Bi
All of these
In the poling method used to purify a metal, the molten metal is stirred with the logs of green wood. This is because the logs of green wood ______.
stir the molten metal thoroughly.
absorb the impurities present in the crude metal.
release hydrogen which reduces the impurities present in the crude metal.
release hydrocarbon gases which reduce the impurities present in the crude metal.
Van Arkel method of purification of metals involves the conversion of the metal into a ______.
volatile stable compound
non-volatile unstable compound
non-volatile stable compound
volatile unstable compound
During electrolytic refining ______.
The metal is directly transferred from the anode to the cathode.
The metal is directly transferred from the cathode to the anode.
The metal ions from the electrolytic solution get deposited on the cathode.
An equivalent of metal passes from the anode to the electrolyte solution.
In zone refining ______.
The impure metal rod is kept stationary and the heater ring is moved.
The heater ring is kept stationary and the metal rod is moved.
The impurities get accumulated at the centre of the rod.
The impurities get accumulated at one end of the rod.
Which of the following ores does not contain oxygen?
Magnesite
Zincite
Epsom salt
Cryolite
Which of the following ores is not concentrated by electromagnetic method?
Haematite
Wolframite
Casseterite
Galena
In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false?
CO and CO2 are produced in this process.
Al2O3 is mixed with CaF2 which lowers the melting point of the mixture and brings conductivity.
Al3+ is reduced at the cathode to form Al.
Na3AlF5 serves as the electrolyte.
Copper is purified by electrolytic refining of blister copper. The correct statement(s) about this process is (are):
impure Cu strip is used as cathode.
acidified aqueous CuSO4 is used as electrolyte.
pure Cu deposits at cathode.
impurities settle as anode-mud.
Which one of the following ores is best concentrated by froth floatation method?
Magnetite
Siderite
Galena
Malachite
Match items of 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) (B) (C) (D) (iv) (ii) (iii) (i) (A) (B) (C) (D) (ii) (iii) (i) (v) (A) (B) (C) (D) (i) (ii) (iii) (iv) (A) (B) (C) (D) (iii) (iv) (v) (i)
Extraction of gold and silver involves leaching with CN− ion. Silver is later recovered by ______.
Liquation
Distillation
Zone refining
Displacement with Zn
Considering the Ellingham diagram, which of the following metals can be used to reduce alumina?
Fe
Cu
Mg
Zn
Match the refining methods (Column I) with metals (Column II).
| Column I (Refining methods) | Column II (Metals) |
| (I) Liquation | (a) Zr |
| (II) Zone Refining | (b) Ni |
| (III) Mand Process | (c) Sn |
| (IV) Van Arkel Method | (d) Ga |
(I) - (c); (II) - (a); (III) - (b); (IV) - (d)
(I) - (c); (II) - (d); (III) - (b); (IV) - (a)
(I) - (b); (II) - (d); (III) - (a); (IV) - (c)
(I) - (b); (II) - (c); (III) - (d); (IV) - (a)
The correct statement is:
Zincite is a carbonate ore.
Sodium cyanide cannot be used in the metallurgy of silver.
Aniline is a froth stabilizer.
Zone refining process is used for the refining of titanium.
The idea of froth floatation method came from a person X and this method is related to the process Y of ores. X and Y, respectively, are:
washer woman and concentration
fisher woman and concentration
washer man and reduction
fisher man and reduction
Identify the incorrect statement.
Gangue is an ore contaminated with undesired materials.
The scientific and technological process used for isolation of the metal from its ore is known as metallurgy.
Minerals are naturally occurring chemical substances in the earth’s crust.
Ores are minerals that may contain a metal.
Identify the correct statement from the following:
Wrought iron is impure iron with 4% carbon.
Blister copper has blistered appearance due to evolution of CO2.
Vapour phase refining is carried out for nickel by van Arkel method.
Pig iron can be moulded into a variety of shapes.
An Ellingham diagram provides information about ______.
the kinetics of the reduction process.
the conditions of pH and potential under which a species is thermodynamically stable.
the pressure dependence of the standard electrode potentials of reduction reactions involved in the extraction of metals.
the temperature dependence of the standard Gibbs energies of formation of some metal oxides.
The maximum temperature that can be achieved in blast furnace is ______.
up to 5000 K
up to 1200 K
up to 2200 K
up to 1900 K
Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature?
Zone refining
Electrolysis
Chromatography
Distillation
The process that involves the removal of sulphur from the ores is ______.
Refining
Roasting
Smelting
Leaching
Which of the following reduction reaction can not be carried out with coke?
\[\ce{Al2O3 -> Al}\]
\[\ce{ZnO -> Zn}\]
\[\ce{Fe2O3 -> Fe}\]
\[\ce{Cu2O -> Cu}\]
Match List-I and List-II.
| List-I | List-II | ||
| (A) | Haematite | (i) | Al2O3 . xH2O |
| (B) | Bauxite | (ii) | Fe2O3 |
| (C) | Magnetite | (iii) | CuCO3 . Cu(OH)2 |
| (D) | Malachite | (iv) | Fe3O4 |
Choose the correct answer from the options given below.
A - (ii), B - (iii), C - (i), D - (iv)
A - (iv), B - (i), C - (ii), D - (iii)
A - (i), B - (iii), C - (ii), D - (iv)
A - (ii), B - (i), C - (iv), D - (iii)
The chemical that is added to reduce the melting point of the reaction mixture during the extraction of aluminium is ______.
Cryolite
Bauxite
Calamine
Kaolite official
Match List-I with List-II.
| List-I | List-II | ||
| (A) | Mercury | (i) | Vapour phase refining |
| (B) | Copper | (ii) | Distillation refining |
| (C) | Silicon | (iii) | Electrolytic refining |
| (D) | Nickel | (iv) | Zone refining |
Choose the most appropriate answer from the option given below.
A - (i), B - (iv), C - (ii), D - (iii)
A - (ii), B - (iii), C - (i), D - (iv)
A - (ii), B - (iii), C - (iv), D - (i)
A - (ii), B - (iv), C - (iii), D - (i)
The role of depressants in froth floatation method is to ______.
Selectively prevent one component of the ore from coming to the froth.
Reduce the consumption of oil for froth formation.
Stabilize the froth.
Enhance non-wettability of the mineral particles.
In the metallurgical extraction of copper, following reaction is used:
\[\ce{FeO + SiO -> FeSiO3}\]
FeO and SiO3 respectively are ______.
Gangue and flux
Flux and slag
Slag and flux
Gangue and slag
The correct statement(s) related to the metal extraction processes is (are):
A mixture of PbS and PbO undergoes self reduction to produce Pb and SO2.
In the extraction process of copper from copper pyrites, silica is added to produce copper silicate.
Partial oxidation of sulphide ore of copper by roasting followed by self reduction produces blister copper.
In cyanide process, Zinc powder is utilized to precipitate gold from Na[Au(CN)2].
Match List-I with List II.
| List I (ores) | List II (composition) | ||
| (i) | Haematite | (A) | Fe3O4 |
| (ii) | Magnetite | (B) | ZnCO3 |
| (iii) | Calamine | (C) | Fe2O3 |
| (iv) | Kaolinite | (D) | [Al2(OH)4 Si2O5] |
Choose the correct answer from the options given below:
(i) - (C), (ii) - (A), (iii) - (B), (iv) - (D)
(i) - (C), (ii) - (A), (iii) - (D), (iv) - (B)
(i) - (A), (ii) - (C), (iii) - (B), (iv) - (D)
(i) - (A), (ii) - (B), (iii) - (C), (iv) - (D)
Which of the following chemical reactions represents Hall- Heroult Process?
\[\ce{Cr2O3 + 2Al -> Al2O3 + 2Cr}\]
\[\ce{2Al2O3 + 3C -> 4Al + 3CO2}\]
\[\ce{FeO + CO -> Fe + CO2}\]
\[\ce{2[Au(CN)2]_{(aq)} + Zn_{(s)} -> 2Au_{(s)} + [Zn(CN4)^{2-}]}\]
In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved?
Zinc
Gold
Silver
Copper
Match List-I with List-II.
| List-I | List-II | ||
| (A) | Concentration of gold ore | (i) | Aniline |
| (B) | Leaching of alumina | (ii) | NaOH |
| (C) | Froth stabiliser | (iii) | SO2 |
| (D) | Blister copper | (iv) | NaCN |
Choose the correct answer from the options given below:
A - (iv), B - (iii), C - (ii), D - (i)
A - (iv), B - (ii), C - (i), D - (iii)
A - (iii), B - (i), C - (i), D - (iv)
A - (ii), B - (iv), C - (iii), D - (i)
The electrochemical extraction of aluminium from bauxite ore involves ______.
The reaction of Al2O3 with coke (C) at a temperature > 2500°C.
The neutralization of aluminate solution by passing gas to precipitate hydrated alumina (Al2O3 . 3H2O).
The dissolution of Al2O3 in hot aqueous NaOH.
The electrolysis of Al2O3 mixed with Na3AIF6 to give Al and CO2.
Nootan solutions for Chemistry Part 1 and 2 [English] Class 12 ISC 6 General Principles and Processes of Isolation of Elements FILL IN THE BLANKS TYPE QUESTIONS [Pages 360 - 361]
The compounds of metals which occur in the earth’s crust and are obtained by mining are called ______ and the ______ from which a metal can be extracted profitably are called ______.
Levigation is generally used for the concentration of ______ ores.
The frothing agent used in froth floatation process is ______.
Calcination and roasting processes are carried out in ______ furnace.
An ______ is used to remove basic impurities; it combines with the impurities to form a fusible substance known as ______.
In electrolytic refining, impure metal is made ______ while pure metal acts as ______.
The formula of the sylvine ore is ______.
Feldspar is a ______ ore of ______ and ______.
Baeyer’s process is used when ______ ore contains higher percentage of ______.
The process used for refining of aluminium is known as ______.
Nootan solutions for Chemistry Part 1 and 2 [English] Class 12 ISC 6 General Principles and Processes of Isolation of Elements ASSERTION-REASON TYPE QUESTIONS [Page 361]
The questions given below consist of an Assertion and a Reason. You have to choose the correct answer according to the following clue.
Assertion: All the reactive elements occur in the combined state in nature.
Reason: The compounds of reactive metals are more stable than the metals themselves.
If both Assertion and Reason are CORRECT and Reason is the CORRECT explanation of the Assertion.
If both Assertion and Reason are CORRECT but Reason is not the CORRECT explanation of the Assertion.
If Assertion is CORRECT but Reason is INCORRECT.
If Assertion is INCORRECT but Reason is CORRECT.
Assertion: Fe is more abundant than C on earth.
Reason: Fe is a volatile element, whereas C is non-volatile.
If both Assertion and Reason are CORRECT and Reason is the CORRECT explanation of the Assertion.
If both Assertion and Reason are CORRECT but Reason is not the CORRECT explanation of the Assertion.
If Assertion is CORRECT but Reason is INCORRECT.
If Assertion is INCORRECT but Reason is CORRECT.
Assertion: The core of the earth is basically made of Fe alloyed with Ni.
Reason: The core is the outermost part of the earth.
If both Assertion and Reason are CORRECT and Reason is the CORRECT explanation of the Assertion.
If both Assertion and Reason are CORRECT but Reason is not the CORRECT explanation of the Assertion.
If Assertion is CORRECT but Reason is INCORRECT.
If Assertion is INCORRECT but Reason is CORRECT.
Assertion: Sedimentary rocks are formed by the solidification of the molten substance during the cooling of the planet.
Reason: Sedimentary rocks are secondary rocks.
If both Assertion and Reason are CORRECT and Reason is the CORRECT explanation of the Assertion.
If both Assertion and Reason are CORRECT but Reason is not the CORRECT explanation of the Assertion.
If Assertion is CORRECT but Reason is INCORRECT.
If Assertion is INCORRECT but Reason is CORRECT.
Assertion: The collectors used in froth floatation. process help ore particles to pass on into the froth.
Reason: The collectors get attached to the polar groups of the grains of mineral and make them water repellent.
If both Assertion and Reason are CORRECT and Reason is the CORRECT explanation of the Assertion.
If both Assertion and Reason are CORRECT but Reason is not the CORRECT explanation of the Assertion.
If Assertion is CORRECT but Reason is INCORRECT.
If Assertion is INCORRECT but Reason is CORRECT.
Assertion: Copper obtained after bessemerisation is known as blister-copper.
Reason: Blisters are produced on the surface of the metal due to escaping of sulphur dioxide gas during cooling.
If both Assertion and Reason are CORRECT and Reason is the CORRECT explanation of the Assertion.
If both Assertion and Reason are CORRECT but Reason is not the CORRECT explanation of the Assertion.
If Assertion is CORRECT but Reason is INCORRECT.
If Assertion is INCORRECT but Reason is CORRECT.
Assertion: Magnesium can reduce Al2O3 at a temperature below 1350°C while above 1350°C aluminium can reduce MgO.
Reason: The melting and boiling points of magnesium are lower than those of aluminium.
If both Assertion and Reason are CORRECT and Reason is the CORRECT explanation of the Assertion.
If both Assertion and Reason are CORRECT but Reason is not the CORRECT explanation of the Assertion.
If Assertion is CORRECT but Reason is INCORRECT.
If Assertion is INCORRECT but Reason is CORRECT.
Nootan solutions for Chemistry Part 1 and 2 [English] Class 12 ISC 6 General Principles and Processes of Isolation of Elements NCERT TEXT-BOOK Exercises [Pages 361 - 363]
Copper can be extracted by hydrometallurgy but not zinc. Explain.
What is the role of depressant in froth floatation process?
Why is the extraction of copper from pyrites more difficult than that from its oxide ore through reduction?
Explain the zone refining process with an example.
Explain column chromatography.
Out of C and CO, which is a better reducing agent at 673 K?
Name the common elements present in the anode mud in electrolytic refining of copper. Why are they so present?
Write down the reactions taking place in different zones in the blast furnace during the extraction of iron.
Write chemical reactions taking place in the extraction of zinc from zinc blende.
State the role of silica in the metallurgy of copper.
What is chromatography?
What criterion is followed for the selection of the stationary phase in chromatography?
Describe a method for refining nickel.
How can you separate alumina from silica in a bauxite ore associated with silica? Give equations, if any.
Giving examples, differentiate between ‘roasting’ and ‘calcination’.
How is ‘cast iron’ different from ‘pig iron’?
Differentiate between “minerals” and “ores”.
Why copper matte is put in silica lined converter?
What is the role of cryolite in the metallurgy of aluminium?
How is leaching carried out in case of low grade copper ores?
Why is zinc not extracted from zinc oxide through reduction using CO?
The value of ΔfG° for formation of Cr2O3 is −540 kJ mol−1 and that of Al2O3 is −827 kJ mol−1. Is the reduction of Cr2O3 possible?
Out of C and CO, which is a better reducing agent for ZnO?
The choice of a reducing agent in a particular case depends on thermodynamic factor. How far do you agree with this statement? Support your opinion with two examples.
Name the processes from which chlorine is obtained as a by-product.
What will happen if an aqueous solution of NaCl is subjected to electrolysis?
What is the role of graphite rod in the electrometallurgy of aluminium?
Explain the zone refining process with an example.
Explain the principle of electrolytic refining with an example.
Outline the principles of refining of metals by the following method:
Vapour phase refining
Predict conditions under which Al might be expected to reduce MgO.
Nootan solutions for Chemistry Part 1 and 2 [English] Class 12 ISC 6 General Principles and Processes of Isolation of Elements QUESTIONS FROM ISC EXAMINATION PAPERS [Pages 363 - 364]
Give the balanced equations for the conversion of argentite (Ag2S) to metallic silver.
Name the sulphide ore of Copper. Describe how pure copper is extracted from this ore.
Describe the role of the cryolite in the extraction of aluminium from pure alumina.
Describe the role of the NaCN in the extraction of silver from silver ore.
What is the role of coke in the extraction of iron from its oxides?
Name an important ore of silver.
How is silver extracted from its sulphide ore?
Give balanced chemical equations involved in the extraction of pure silver.
Select and write the correct alternative from the choices given below:
In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide (Cu2O) with ______.
Cuprous sulphide (Cu2S)
Iron sulphide (FeS)
Sulphur dioxide (SO2)
Carbon monoxide (CO)
What is used in the blast furnace to obtain iron from haematite ore?
Electrolytic reduction
Carbon dioxide
Carbon monoxide
Aluminium
With reference to extraction of metal, answer the following:
What is the process of removing impurity from crude metal called?
Roasting
Calcination
Refining
Concentration
With reference to extraction of metal, answer the following:
Which of the following is not a method for the concentration of ores?
Froth floatation
Smelting
Magnetic separation
Gravity separation
Answer the following questions with reference to the extraction of copper from its ore.
Which one of the following is the sulphide ore?
Cuprite
Malachite
Azurite
Chalcopyrite
Answer the following questions with reference to the extraction of copper from its ore.
In the Bessemer converter, copper sulphide is reduced to copper by which one of the following reactions?
\[\ce{Cu2S + FeO -> 2Cu + FeO + S}\]
\[\ce{Cu2S + FeS -> 2Cu + FeS}\]
\[\ce{Cu2S + 2Cu2O -> 6Cu + SO2}\]
\[\ce{Cu2S + Fe -> 2Cu + FeS}\]
Extraction of silver is done mainly from argentite (Ag2S) ore.
The concentrated ore on treatment with dil. NaCN solution and then followed by continuous agitation for several hours, which of the following products are obtained?
AgCN and Na2S
Ag and NaCN
Na2SO4 and Na2SO3
Na[Ag(CN)2] and Na2S
Extraction of silver is done mainly from argentite (Ag2S) ore.
What is the above process of extraction of silver using dilute sodium cyanide known as?
Deacon’s process
Pattinson’s process
Mac-Arthur Forest cyanide process
Parke’s process
Solutions for 6: General Principles and Processes of Isolation of Elements
Nootan solutions for Chemistry Part 1 and 2 [English] Class 12 ISC chapter 6 - General Principles and Processes of Isolation of Elements
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