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Chapters
2: Solutions
3: Electrochemistry
4: Chemical Kinetics
5: Surface Chemistry
▶ 6: General Principles and Processes of Isolation of Elements
7: The p-block Elements
8: The d-block and f-block Elements
9: Coordinate Compounds
10: Haloalkanes and Haloarenes
11: Alcohols, Phenols and Ethers
12: Aldehydes, Ketones and Carboxylic Acids
13: Amines
14: Biomolecules
15: Polymers
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 CBSE, Karnataka Board PUC NCERT for Chemistry [English] Class 12.
NCERT solutions for Chemistry [English] Class 12 6 General Principles and Processes of Isolation of Elements Intext Questions [Pages 150 - 157]
Which of the ores mentioned can be concentrated by magnetic separation method?
What is the significance of leaching in the extraction of aluminium?
The reaction,
Cr2O3 + 2Al → Al2O3 + 2Cr
(ΔGθ = -421kJ) is thermodynamically feasible as is apparent from the Gibbs energy value. Why does it not take place at room temperature?
Is it true that under certain conditions, Mg can reduce SiO2 and Si can reduce MgO? What are those conditions?
NCERT solutions for Chemistry [English] Class 12 6 General Principles and Processes of Isolation of Elements Exercises [Pages 168 - 164]
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: Zone refining
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 meant by the term “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 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 `triangle_tG^theta` for formation of Cr2O3 is − 540 kJmol−1 and that of Al2 O3 is − 827 kJmol−1. Is the reduction of Cr2O3 possible with Al?
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 principle of the method of electrolytic refining of metals. Give one example.
Outline the principles of refining of metals by the following methods: Vapour phase refining
Predict conditions under which Al might be expected to reduce MgO.
Solutions for 6: General Principles and Processes of Isolation of Elements
NCERT solutions for Chemistry [English] Class 12 chapter 6 - General Principles and Processes of Isolation of Elements
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Concepts covered in Chemistry [English] Class 12 chapter 6 General Principles and Processes of Isolation of Elements are Principles and Methods of Extraction - Concentration, Occurrence of Metals, Oxidation Reduction, Refining of Crude Metals, Hydraulic Washing, Magnetic Separation, Froth Floatation Method, Leaching, Extraction of Crude Metal from Concentrated Ore, Thermodynamic Principles of Metallurgy, Application of Thermodynamic Principles of Metallurgy, Electrochemical Principles of Metallurgy, Uses of Aluminium, Copper, Zinc and Iron, General Principles and Processes of Isolation of Elements Numerical, Types of Separation or Concentration of an Ore.
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