Download the latest CBSE Class 12 Chemistry Processes Of Isolation Of Elements Notes Set C in PDF format. These Class 12 Chemistry revision notes are carefully designed by expert teachers to align with the 2025-26 syllabus. These notes are great daily learning and last minute exam preparation and they simplify complex topics and highlight important definitions for Class 12 students.
Chapter-wise Revision Notes for Class 12 Chemistry Unit 06 General Principles and Processes of Isolation of Elements
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Unit 06 General Principles and Processes of Isolation of Elements Revision Notes for Class 12 Chemistry
GENERAL PRINCIPLES AND PROCESSES OF
ISOLATION OF ELEMENTS
VSA QUESTIONS (1 - MARK QUESTIONS)
1. Name three metals which occur in native state in nature.
[Ans. : Au, Ag and Pt]
2. What are collectors in froth flotation process? Give one example.
[Ex. : Pine oil]
3. Give the names and formulae of three ores which are concentrated by froth floatation process.
[Ans. : Galena (PbS), zinc blend (zns) cinnabar (HgS)]
4. Among Fe, Cu, Al and Pb, which metal (s) can not be obtained by smelting.
[Ans. : Al]
5. What is the thermodynamic criteria for the feasibility of a reaction?
[Ans. : ΔG should be –ve or log K = + ve]
8. Why can’t aluminium be reduced by carbon?
[Hint : Al is stronger reducing agent than carbon]
9. Name the most important form of iron. Mention its one use.
[Ans. : Cast iron is used for making gutter pipes, castings, railway sleepers,toys etc.]
10. Name the impurities present in bauxite ore.
[Ans. : SiO2, Fe2O3 and TiO2]
11. What is the composition of copper matte?
[Hint : Cu2S and FeS]
12. Which from of copper is called blister copper?
13. What are froth stabilizers? Give two examples.
[Ex. : Cresol and aniline].
14. A sample of galena is contaminated with zinc blend. Name one chemical which can be used to concentrate galena selectively by froth floatation method. [Ans. : NaCN]
15. What are the constituents of German silver?
[Ans. : Cu = 25-30%, Zn = 25-30%, Ni = 40-50%]
16. Why is froth floatation process selected for concentration of the sulphide ore?
[Ans. : Sulphide ore particles are wetted by oil (Pine oil) and gangue particles by water]
17. Write the reaction involved in the extraction of copper from low grade ores.
[Ans. : First step is leaching of ore with acid or bacteria then
Cu2+ (aq) + H2 (g) → Cu(s) + 2H+ (g)]
18. Although aluminium is above hydrogen in the electrochemical series, it is stable in air and water. Why?
19. Which method of purification is represented by the following reaction
20. Zinc is used but not copper for the recovery of metallic silver from the complex [Ag(CN)2]–, although electrode potentials of both zinc and copper are less than that of Ag. Explain why?
[Hint : Zinc reacts at faster rate as compared with copper, further zinc is cheaper than copper].
21. Write the composition of motlen mixture which is electrolysed to extract aluminium.
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CBSE Class 12 Chemistry Unit 06 General Principles and Processes of Isolation of Elements Notes
Students can use these Revision Notes for Unit 06 General Principles and Processes of Isolation of Elements to quickly understand all the main concepts. This study material has been prepared as per the latest CBSE syllabus for Class 12. Our teachers always suggest that Class 12 students read these notes regularly as they are focused on the most important topics that usually appear in school tests and final exams.
NCERT Based Unit 06 General Principles and Processes of Isolation of Elements Summary
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Unit 06 General Principles and Processes of Isolation of Elements Complete Revision and Practice
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You can download the teacher prepared revision notes for CBSE Class 12 Chemistry Processes Of Isolation Of Elements Notes Set C from StudiesToday.com. These notes are designed as per 2025-26 academic session to help Class 12 students get the best study material for Chemistry.
Yes, our CBSE Class 12 Chemistry Processes Of Isolation Of Elements Notes Set C include 50% competency-based questions with focus on core logic, keyword definitions, and the practical application of Chemistry principles which is important for getting more marks in 2026 CBSE exams.
Yes, our CBSE Class 12 Chemistry Processes Of Isolation Of Elements Notes Set C provide a detailed, topic wise breakdown of the chapter. Fundamental definitions, complex numerical formulas and all topics of CBSE syllabus in Class 12 is covered.
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