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

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

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

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

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

5. Concentration of sulphide ore is done by:

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

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

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

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

10. Formula of copper pyrite is:

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

12. In metallurgical process, aluminium acts as:

13. Common impurities present in bauxite are:

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

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

16. The purest form of iron is:

17. Cassiterite is the ore of which metal?

18. Bessemer converter is used in the manufacture of:

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

20. In the equation,

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