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

1. Formula of copper pyrite is:

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

3. Bessemer converter is used in the manufacture of:

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

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

6. Cassiterite is the ore of which metal?

7. The purest form of iron is:

8. In metallurgical process, aluminium acts as:

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

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

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

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

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

14. Common impurities present in bauxite are:

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

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

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

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

19. In the equation,

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

20. Concentration of sulphide ore is done by: