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

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

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

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

4. The purest form of iron is:

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

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

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

8. In metallurgical process, aluminium acts as:

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

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

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

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

13. Cassiterite is the ore of which metal?

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

15. Concentration of sulphide ore is done by:

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

17. Common impurities present in bauxite are:

18. Formula of copper pyrite is:

19. Bessemer converter is used in the manufacture of:

20. In the equation,

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