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

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

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

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

4. In metallurgical process, aluminium acts as:

5. Formula of copper pyrite is:

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

7. Bessemer converter is used in the manufacture of:

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

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

10. In the equation,

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

11. Concentration of sulphide ore is done by:

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

13. The purest form of iron is:

14. Common impurities present in bauxite are:

15. Cassiterite is the ore of which metal?

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

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

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

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

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