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

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

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

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

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

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

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

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

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

9. Common impurities present in bauxite are:

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

11. Cassiterite is the ore of which metal?

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

13. Formula of copper pyrite is:

14. The purest form of iron is:

15. Concentration of sulphide ore is done by:

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

17. In metallurgical process, aluminium acts as:

18. In the equation,

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

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

20. Bessemer converter is used in the manufacture of: