# NCERT solutions for Class 12 Chemistry chapter 6 - General Principles and Processes of Isolation of Elements [Latest edition]

## Chapter 6: General Principles and Processes of Isolation of Elements

[Pages 150 - 157]

### NCERT solutions for Class 12 Chemistry Chapter 6 General Principles and Processes of Isolation of Elements [Pages 150 - 157]

Q 1 | Page 150

Which of the ores mentioned can be concentrated by magnetic separation method?

Q 2 | Page 150

What is the significance of leaching in the extraction of aluminium?

Q 3 | Page 157

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?

Q 4 | Page 157

Is it true that under certain conditions, Mg can reduce SiO2 and Si can reduce MgO? What are those conditions?

[Pages 163 - 164]

### NCERT solutions for Class 12 Chemistry Chapter 6 General Principles and Processes of Isolation of Elements [Pages 163 - 164]

Q 1 | Page 163

Copper can be extracted by hydrometallurgy but not zinc. Explain.

Q 2 | Page 163

What is the role of depressant in froth floatation process?

Q 3 | Page 163

Why is the extraction of copper from pyrites more difficult than that from its oxide ore through reduction?

Q 4.1 | Page 163

Explain: Zone refining

Q 4.2 | Page 163

Explain Column chromatography.

Q 5 | Page 163

Out of C and CO, which is a better reducing agent at 673 K?

Q 6 | Page 163

Name the common elements present in the anode mud in electrolytic refining of copper. Why are they so present ?

Q 7 | Page 163

Write down the reactions taking place in different zones in the blast furnace during the extraction of iron.

Q 8 | Page 163

Write chemical reactions taking place in the extraction of zinc from zinc blende.

Q 9 | Page 163

State the role of silica in the metallurgy of copper.

Q 10 | Page 163

What is meant by the term “chromatography”?

Q 11 | Page 163

What criterion is followed for the selection of the stationary phase in chromatography?

Q 12 | Page 164

Describe a method for refining nickel.

Q 13 | Page 164

How can you separate alumina from silica in bauxite ore associated with silica? Give equations, if any

Q 14 | Page 164

Giving examples, differentiate between ‘roasting’ and ‘calcination’.

Q 15 | Page 164

How is 'cast iron' different from 'pig iron'?

Q 16 | Page 164

Differentiate between “minerals” and “ores”.

Q 17 | Page 164

Why copper matte is put in silica lined converter?

Q 18 | Page 164

What is the role of cryolite in the metallurgy of aluminium?

Q 19 | Page 164

How is leaching carried out in case of low grade copper ores?

Q 20 | Page 164

Why is zinc not extracted from zinc oxide through reduction using CO?

Q 21 | Page 164

The value of triangle_tG^theta for formation of Cr2Ois − 540 kJmol−1 and that of Al2 O3 is − 827 kJmol−1. Is the reduction of Cr2O3 possible with Al?

Q 22 | Page 164

Out of C and CO, which is a better reducing agent for ZnO ?

Q 23 | Page 164

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.

Q 24 | Page 164

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?

Q 25 | Page 164

What is the role of graphite rod in the electrometallurgy of aluminium?

Q 26 | Page 164

Explain the principle of the method of electrolytic refining of metals. Give one example.

Q 27 | Page 164

Outline the principles of refining of metals by the following methods:  Vapour phase refining

Q 28 | Page 164

Predict conditions under which Al might be expected to reduce MgO.

## NCERT solutions for Class 12 Chemistry chapter 6 - General Principles and Processes of Isolation of Elements

NCERT solutions for Class 12 Chemistry chapter 6 (General Principles and Processes of Isolation of Elements) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CBSE Class 12 Chemistry solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Class 12 Chemistry chapter 6 General Principles and Processes of Isolation of Elements are Principles and Methods of Extraction - Concentration, Occurrence of Metals, Oxidation Reduction, Refining, 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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