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. In the equation,

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

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

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

5. Bessemer converter is used in the manufacture of:

6. The purest form of iron is:

7. Formula of copper pyrite is:

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

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

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

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

12. In metallurgical process, aluminium acts as:

13. Concentration of sulphide ore is done by:

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

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

16. Cassiterite is the ore of which metal?

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

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

19. Common impurities present in bauxite are:

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