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

1. In metallurgical process, aluminium acts as:

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

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

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

5. Bessemer converter is used in the manufacture of:

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

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

8. Common impurities present in bauxite are:

9. Concentration of sulphide ore is done by:

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

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

12. The purest form of iron is:

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

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

15. In the equation,

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

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

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

18. Cassiterite is the ore of which metal?

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

20. Formula of copper pyrite is: