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

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

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

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

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

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

6. Formula of copper pyrite is:

7. Common impurities present in bauxite are:

8. In metallurgical process, aluminium acts as:

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

10. Concentration of sulphide ore is done by:

11. Cassiterite is the ore of which metal?

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

13. In the equation,

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

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

15. Bessemer converter is used in the manufacture of:

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

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

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

19. The purest form of iron is:

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