General Principles and Processes of Isolation of Elements Class 12 MCQs Questions with Answers

1. The method of zone refining of metals is based upon the principle of:

2. For which of the following ores froth floatation method is used for concentration?

3. In the equation,

4M + 8CN– + H2O + O2 → 4[M(CN)2]– + 4OH–, the metal M is

4. Bessemer converter is used in the manufacture of:

5. Cassiterite is the ore of which metal?

6. In metallurgical process, aluminium acts as:

7. The purest form of iron is:

8. Sulphide ore of zinc/copper is concentrated by:

9. Concentration of sulphide ore is done by:

10. Formula of copper pyrite is:

11. Heating ore with carbon in the absence of air is known as:

12. Common impurities present in bauxite are:

13. Which of the following oxides cannot be reduced by hydrogen?

14. In a thermite process is used as reducing agent:

15. The significance of leaching in the extraction of aluminium is:

16. Electrolytic reduction of Al2O3 to Al by Hall- Herault process is carried out:

17. The oil used as frothing agent in froth floatation process is:

18. Which of the following ores is concentrated by chemical leaching method?

19. During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’. These are:

20. The method of zone refining of metals is based on the principle of: