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

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

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

3. In the equation,

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

4. Common impurities present in bauxite are:

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

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

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

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

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

10. Concentration of sulphide ore is done by:

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

12. Bessemer converter is used in the manufacture of:

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

14. The purest form of iron is:

15. In metallurgical process, aluminium acts as:

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

17. Cassiterite is the ore of which metal?

18. Formula of copper pyrite is:

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

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