Free NCERT Solutions For Class 12 Chemistry Chapter 6 : General Principles and Processes of Isolotion of Elements Free PDF Download
Which of the ores mentioned can be concentrated by magnetic separation method?
What is the significance of leaching in the extraction of aluminium?
Copper can be extracted by hydrometallurgy but not zinc. Explain
What is the role of depressant in froth-floatation process?
(i) Zone refining
(ii) Column chromatography
Out of C and CO which is a better reducing agent at 673K?
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
In the blast furnace reduction of iron oxides take place at different temperature ranges as shown
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”?
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?
Why is zinc not extracted from zinc oxide through reduction using CO?
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?
Outline the principles of refining of metals by the following methods:
(i) Zone refining
(ii) Electrolytic refining
(iii) Vapour phase refining
Predict conditions under which Al might be expected to reduce MgO