General Principles and Processes of Isolation of Elements MCQs Mock Test of Class 12th Chemistry

Question 1. Blister copper is

Question 2. Which of the following slags is produced during extraction of iron?

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

Question 4. The salt which is least likely to be found in minerals is

Question 5. Concentration of sulphide ore is done by

Question 6. Malachite is an ore of

Question 7. Formula of copper pyrite is

Question 8. Ore of aluminium is

Question 9. Removal of the unwanted materials like sand, clays, etc. from the ore is known as ………., …….. or ……….

Question 10. For which of the following ores froth floatation method is used for concentration?

Question 11. The powdered ore is agitated with water or washed with running stream of water. The heavy ore particles and lighter impurities are separated. This method of concentration is known as

Question 12. The oil used as frothing agent in froth floatation process is

Question 13. Which of the following metals is not extracted by leaching?

Question 14. Sulphide ore of zinc/copper is concentrated by

Question 15. Which of the following ores is concentrated by chemical leaching method?

Question 16. How do we separate two sulphide ores by froth floatation method?

Question 17. Common impurities present in bauxite are

Question 18. An ore of tin containing FeCrO4 is concentrated by

Question 19. Which of the following ores cannot be concentrated by magnetic separation?

Question 20. The significance of leaching in the extraction of aluminium is

Question 21. Which of the following metals is extracted using a silica lined convertor?

Question 22. Which of the following sulphides when heated strongly in air gives the corresponding metal without undergoing separate reduction of oxide?

Question 21. Which of the following metals cannot be obtained by reduction of its metal oxide bv aluminium ?

Question 22. Heating pyrites to remove sulphur is called

Question 23. Impurities of sulphur, silicon and phosphorus can be removed from cast iron by adding

Question 24. In metallurgical process, aluminium acts as

Question 25. Ellingham diagram represents change of

Question 26. During the extraction of haematite, limestone is added which acts as

Question 27. In blast furnace iron oxide is reduced by

Question 28. From the Ellingham graph between Gibb’s energy and temperature, out of C and CO with is a better reducing agent for ZnO?

Question 29. In a thermite process is used as reducing agent.

Question 30. Which of the following metals is leached by Cyanide process?

Question 31. In the equation 4 M + 8 CN– + 2H2O + O2 → 4 [M(CN)2]– + 4OH–, the metal M is

Question 32. Pyrolusite is a/an

Question 33. Which of the following metals is sometimes found native in nature?

Question 34. In the process of extraction of gold. Identify the complexes [X] and [Y].

Question 35. The method of zone refining of metals is based on the principle of

Question 36. In the extraction of copper from its sulphide ore, the metal is formed by the reduction of Cu2O with

Question 37. Heating pyrites to remove sulphur is called

Question 38. In the metallurgy of which of the follo wing, cupellation process is used?

Question 39. Which of the following metals is most abundant in the earth’s crust?

Question 40. Which method of purification is represented by the equations:

Question 41. Which of the following benefication process is used for the mineral Al2O3.2H2O?

Question 42. Which method of purification is represented by the equations

Question 43. The Mond’s process of refining is used for which of the following metals?

Question 44. During smelting an additional substance is added which combines with impurities to form a fusible mass. The additional substance is called

Question 45. Which of the following metals is obtained by leaching the ore With dilute cyanide solution?

Question 46. Zone-refining process has been employed for preparing ultra pure samples of

Question 47. The process of isolation of metals by dissolving the ore in a suitable chemical eagent following by precipitation of the metal by a more electropositive metal is called

Question 48. Smelting involves reduction of the metal oxide with

Question 49. Which of the following is an ore of Aluminium?

Question 50. The process of extracting the metal from its ore is called