CBSE Class 12 Chemistry General Principles Process of Isolation of Elements Questions

CBSE Class 12 Chemistry General Principles Process of Isolation of Elements Questions. CBSE,CCE and NCERT students can refer to the attached file. All educational material on the website has been prepared by the best teachers having more than 20 years of teaching experience in various schools. The study material available on our website for all CBSE classes and subjects have been prepared by teachers from all over the country. All study material has been carefully designed keeping into mind the latest CBSE examination trends.  


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].

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