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

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

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

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

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

5. In metallurgical process, aluminium acts as:

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

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

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

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

10. Cassiterite is the ore of which metal?

11. Bessemer converter is used in the manufacture of:

12. Common impurities present in bauxite are:

13. In the equation,

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

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

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

16. Formula of copper pyrite is:

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

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

19. The purest form of iron is:

20. Concentration of sulphide ore is done by: