1. Three most occurring elements into the earth crust are:
| (a) O, Si, Al (c) Fe, Ca, Al | (b) Si, O, Fe (d) Si, O, N |
| 2. An example of an oxide ore is | |
| (a) Bauxite (c) Zinc blende | (b) Malachite (d) Feldspar |
| (a) Zn, Cu, Na (c) Fe, Al, Ti | (b) Zn, Cu, Pb (d) Cu, Ag, Au |
| 4. Which of the following is not an ore of Magnesium? | |
| (a) Carnallite (c) Dolomite | (b) Magnesite (d) Gypsum |
| (a) Bauxite (c) Epsomite | (b) Corundum (d) Cryolite |
| 6. Which one contains both Ca and Mg? | |
| (a) Limestone | (b) Dolomite |
| (c) Chalk | (d) Feldspar |
7. Which of the following minerals does not contain iron? | |
| (a) Magnetite (c) Haematite | (b) Magnesite (d) Limonite |
| (a) Ni, Pt (c) Pt, Au | (b) Zn, Cd (d) Sn, Pb |
| 9. Which of the following contain Fe as well as Cr? | |
| (a) Wolframite (c) Pyrolusite | (b) Chromite (d) Chalcopyrite |
(a) Oxide ore (b) Sulphate ore
(c) Carbonate ore (d) Sulphide ore
11. Haematite ore is concentrated by:
(a) Gravity separation method
(b) Froth floatation process
(c) Amalgamation
(d) Hand picking
12. In the extraction of copper from its sulphide ore, the metal is formed by reduction of Cu2O with:
| (a) FeS (c) Cu2S | (b) CO (d) SO2 |
| 13. The element which is recovered from electrolytic | |
| process is: (a) Iron (c) Aluminium | (b) Lead (d) Zinc |
(a) Cupellation
(b) Electrorefining
(c) Both (a) and (b)
(d) None of these
15. Impure aluminium is purified by:
(a) Baeyer’s process
(b) Hall’s process
(c) Hoop’s Process
(d) Serpeck’s process
16. In the alumino-thermite process, Al metal acts as:
(a) Oxidizing agent
(b) Reducing agent
(c) Catalyst
(d) Flux
17. Slag is formed by reaction between:
(a) Impurities and coke
(b) Impurities and ore
(c) Impurities and flux
(d) Flux and coke
m18. Which of the following statement is correct?
(a) All ores are minerals
(b) All minerals are ores
(c) Calcination is generally carried out in blast furnace
(d) Oxide ores are concentrated by froth floatation process.
19. Purification of silicon element used in semiconductors is done by:
(a) Zone refining
(b) Heating
(c) Froth floatation
(d) Heating in vacuum
20. Which one of following beneficiation processes is used for the mineral Al 2O3.2H2O?
(a) Froth floatation (b) Leaching
(c) Liquation (d) Magnetic separation
21. In blast furnace, maximum temperature is in:
(a) Zone of fusion
(b) Zone of combustion
(c) Zone of slag formation
(d) Zone of reduction
22. When a metal is to be extracted from its ore and if the gangue associated with the ore is silica,
then:
(a) An acidic flux is needed
(b) A basic flux is needed
(c) Both acidic and basic fluxes are needed
(d) Neither of them is needed
23 Silver containing lead as an impurity is removed by:
| (a) Poling (c) Lavigation | (b) Cupellation (d) Distillation |
(a) Levigation
(b) Electromagnetic separation
(c) Froth-floatation
(d) Liquification
25. For which ore of the metal, froth floatation method is used for concentration?
| (a) Horn silver (c) Cinnabar | (b) Bauxite (d) Haematite |
26. In which of the following minerals, aluminium is not
present? | |
(a) Cryolite (c) Feldspar | (b) Mica (d) Fluorspar |
27. Gravity separation process may be used for the concentration of:
| (a)Chalcopyrite (c) Haematite | (b) Bauxite (d) Calamine |
(a) Highly electropositive elements
(b) Highly electronegative elements
(c) Transition metals
(d) Noble metals
29. Bauxite is leached with:
| (a) KCN (c) NaOH 30. In the equation: | (b) NaCN (d) Na2CO3 |
| 4M + 8CN- + 2H2O + O2 " 4[M(CN)2] +4OH Identify the metal M: | |
| (a) Cu (c) Au | (b) Fe (d) Zn |
Answer:
1. (a) 2. (a) 3. (b) 4. (d) 5. (c) 6. (b) 7. (b) 8. (c) 9. (b) 10. (d)
11. (a) 12. (c) 13. (c) 14. (c) 15. (c) 16. (b) 17. (c) 18. (a) 19. (a) 20. (b)
21. (b) 22. (b) 23. (b) 24. (a) 25. (c) 26. (d) 27. (a) 28. (a) 29. (c) 30. (c)
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