Unit 6 » General Principles and Processes of Isolation of Elements- MCQs (12th) | Chemistry | Objective Questions- 12th

Multiple Choice

ID- 12863

BSEB, 2020 (A)

1. Which one of the following is not an ore of zinc?

(A) Zinc blende
(B) Calamine
(C) Zincite
(D) Bauxite

Sep 13, 2022 at 08:38 PM

Multiple Choice

ID- 12864

BSEB, 2020 (A)

2. Which of the following metals does not liberate hydrogen gas or reaction which acid?

(A) Fe
(B) Zn
(C) Cu
(D) Mg

Sep 13, 2022 at 08:39 PM

Multiple Choice

ID- 12871

BSEB, 2020 (A)

3. Which of the following statement is true?

(A) All ores are minerals
(B) All minerals are one
(C) All alkalis are not bases
(D) All of these

Sep 14, 2022 at 05:31 AM

Multiple Choice

ID- 12872

BSEB, 2020 (A)

4. Mineral from which metal is extracted, is called:

(A) Ore
(B) Gangue
(C) Slag
(D) none of these

Sep 14, 2022 at 05:32 AM

Multiple Choice

ID- 12873

BSEB, 2020 (A)

5. Which of the following oxides is reduced in blast furnace?

(A) Oxide of iron
(B) Oxide of copper
(C) Sodium oxide
(D) Zinc oxide

Sep 14, 2022 at 05:33 AM

Multiple Choice

ID- 12874

BSEB, 2019 (C)

6. When a metal oxide is heated with carbon, then metal is formed, MxOy + yC → xM + yCO, here carbon acts as:

(A) oxidising agent
(B) Reducing agent
(C) Stabilizer
(D) None of these

Sep 14, 2022 at 05:36 AM

Multiple Choice

ID- 12875

BSEB, 2019 (C)

7. The chief ore of copper is:

(A) Copper pyrite
(B) Copper Glance
(C) Galena
(D) Siderite

Sep 14, 2022 at 05:37 AM

Multiple Choice

ID- 12876

BSEB, 2016, 2017 (A), 2021 (A)

8. Concentration of sulphide ore is done by:

(A) froth flotation process
(B) electrolysis
(C) roasting
(D) None of these

Sep 14, 2022 at 05:39 AM

Multiple Choice

ID- 12877

9. Malachite is an ore of:

(A) iron
(B) copper
(C) zinc
(D) silver

Sep 14, 2022 at 05:40 AM

Multiple Choice

ID- 12878

BSEB, 2010, 2015, 2018 (A), 2021 (A)

10. Formula of copper pyrite is:

(A) Cu₂S
(B) CuFeS
(C) CuFeS₂
(D) Cu₂Fe₂S₂

Sep 14, 2022 at 05:43 AM

Multiple Choice

ID- 12879

BSEB, 2015, 2019 (C)

11. Ore of aluminium is:

(A) bauxite
(B) hematite
(C) dolomite
(D) None of these

Sep 14, 2022 at 05:44 AM

Multiple Choice

ID- 12880

BSEB, 2019 (A)

12. Chief ore of Iron is:

(A) Megnetite
(B) Siderite
(C) Haematite
(D) All

Sep 14, 2022 at 06:01 AM

Multiple Choice

ID- 12881

BSEB, 2019 (A)

13. A process of heating ore of a metal is excess of air below its melting point is called:

(A) Roasting
(B) Smelting
(C) Calcination
(D) All

Sep 14, 2022 at 06:03 AM

Multiple Choice

ID- 12882

BSEB, 2019 (A)

14. Copper metal is purified by which of the following method:

(A) Electrolytic refining
(B) Zone refining
(C) Chromatography
(D) None

Sep 14, 2022 at 06:04 AM

Multiple Choice

ID- 12883

15. The oil uses as frothing agent in froth flotation process is:

(A) coconut oil
(B) castor oil
(C) palmitic oil
(D) pine oil

Sep 14, 2022 at 06:05 AM

Multiple Choice

ID- 12884

16. Which of the following metals in not extracted by leaching?

(A) Aluminium
(B) Mercury
(C) Silver
(D) gold

Sep 14, 2022 at 06:06 AM

Multiple Choice

ID- 12885

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

(A) floatation process
(B) electromagnetic process
(C) gravity separation
(D) distillation

Sep 14, 2022 at 06:08 AM

Multiple Choice

ID- 12886

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

(A) Cinnabar
(B) Argentite
(C) Copper pyrites
(D) Galena

Sep 14, 2022 at 06:09 AM

Multiple Choice

ID- 12887

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

(A) By using excess of pine oil
(B) By adjusting proportion of oil to water or using depressant
(C) By using collectors and froth stabilisers like xanthates
(D) By using some solvent in which one of the sulphides is soluble

Sep 14, 2022 at 06:12 AM

Multiple Choice

ID- 12888

20. Common impurities present in bauxite are:

(A) CuO
(B) ZnO
(C) CaO
(D) SiO₂

Sep 14, 2022 at 06:13 AM

Multiple Choice

ID- 12889

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

(A) Haematite
(B) Malachite
(C) Magnetite
(D) Siderite

Sep 14, 2022 at 06:14 AM

Multiple Choice

ID- 12890

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

(A) Mg
(B) Al
(C) Cu
(D) Zn

Sep 14, 2022 at 06:15 AM

Multiple Choice

ID- 12891

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

(A) Cu₂S
(B) FeS
(C) HgS
(D) ZnS

Sep 14, 2022 at 06:18 AM

Multiple Choice

ID- 12892

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

(A) Cr
(B) Mn
(C) Fe
(D) Mg

Sep 14, 2022 at 06:19 AM

Multiple Choice

ID- 12893

25. Heating pyrites to remove sulphur is called:

(A) smelting
(B) calcination
(C) liquation
(D) roasting

Sep 14, 2022 at 06:20 AM

Multiple Choice

ID- 12894

BSEB, 2021 (A)

26. Galena is an ore of:

(A) Sn
(B) Pb
(C) Si
(D) Ag

Sep 14, 2022 at 06:21 AM

Multiple Choice

ID- 12895

27. In metallurgical process, aluminium acts as

(A) an oxidising agent
(B) a reducing agent
(C) acidic flux
(D) basic flux

Sep 14, 2022 at 06:22 AM

Multiple Choice

ID- 12896

28. Ellingham diagram represents charge of

(A) ∆G with temperature
(B) ∆H with temperature
(C) ∆G with pressure
(D) (∆G – T∆S) with temperature

Sep 14, 2022 at 06:26 AM

Multiple Choice

ID- 12897

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

(A) flux
(B) slag
(C) reducing agent
(D) gangue

Sep 14, 2022 at 06:28 AM

Multiple Choice

ID- 12898

30. In blast furnace iron oxide is reduced by

(A) silica
(B) carbon monoxide
(C) carbon
(D) lime stone

Sep 14, 2022 at 06:28 AM

Multiple Choice

ID- 12899

BSEB, 2021 (A)

31. The process of smelting involves reduction of metal oxide with:

(A) Al
(B) C
(C) Mg
(D) CO

Sep 14, 2022 at 06:29 AM

Multiple Choice

ID- 12900

32. In a thermite process .......... is used as reducing agent.

(A) Zn
(B) Al
(C) Mn
(D) Fe

Sep 14, 2022 at 06:31 AM

Multiple Choice

ID- 12974

33. Blister copper is:

(A) impure copper
(B) obtained in self-reduction process during besseme-risation
(C) Both are correct
(D) None is correct

Sep 14, 2022 at 08:00 PM

Multiple Choice

ID- 12975

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

(A) CaSiO₃
(B) FeSiO₃
(C) MgSiO₃
(D) ZnSiO₃

Sep 14, 2022 at 08:02 PM

Multiple Choice

ID- 12976

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

(A) Ferric oxide
(B) Aluminium oxide
(C) Zinc oxide
(D) Cupric oxide

Sep 14, 2022 at 08:03 PM

Multiple Choice

ID- 12982

36. Which of the following reactions takes place at higher temperature range (900 K - 1500 K) in blast furnace?

(A) 3Fe₂O₃ + CO → CO → 2Fe₃O₄ + CO₂
(B) FeO + CO → Fe + CO₂
(C) Fe₃O₄ + 4CO → 3Fe + 4CO₂
(D) Fe₂O₃ + CO → 2FeO + CO₂

Sep 14, 2022 at 08:13 PM

Multiple Choice

ID- 12984

37. Which of the following metals is obtained by electrolytic reduction process?

(A) Fe
(B) Cu
(C) Ag
(D) Al

Sep 14, 2022 at 08:14 PM

Multiple Choice

ID- 12986

38. Which of the following metals cannot be obtained by electrolysis?

(A) Cr
(B) Na
(C) Ca
(D) Mg

Sep 14, 2022 at 08:15 PM

Multiple Choice

ID- 12987

39. Extraction of chlorine from brine is based on

(A) reduction
(B) displacement
(C) oxidation
(D) evaporation

Sep 14, 2022 at 08:16 PM

Multiple Choice

ID- 12989

40. .......... being highly reactive is used in the extraction of chromium and manganese

(A) Al
(B) Zn
(C) Cu
(D) Mg

Sep 14, 2022 at 08:18 PM

Multiple Choice

ID- 12991

41. Which of the following is not a method of refining of metals?

(A) Electrodialysis
(B) Smelting
(C) Poling
(D) Liquation

Sep 14, 2022 at 08:20 PM

Multiple Choice

ID- 12993

42. In electro-refining of copper, some gold is deposited as

(A) cathode mud
(B) electrolyte
(C) anode mod
(D) cathode

Sep 14, 2022 at 08:23 PM

Multiple Choice

ID- 12996

43. Which of the following is used as a method of purification for silicon?

(A) Electrolytic refining
(B) Liquation
(C) Zone refining
(D) Distillation

Sep 14, 2022 at 08:24 PM

Multiple Choice

ID- 12998

44. Most electropositive metals are obtained from their ores by:

(A) autoreduction
(B) smelting with carbon
(C) electrolysis of fused salts
(D) thermal decomposition

Sep 14, 2022 at 08:32 PM

Multiple Choice

ID- 12999

45. Carnallite on electrolysis gives

(A) Mg and Cl₂
(B) Ca and Cl₂
(C) K and Cl₂
(D) Al and Cl₂

Sep 14, 2022 at 08:34 PM

Multiple Choice

ID- 13000

BSEB, 2016

46. When Quicklime is immersed in water the reaction is:

(A) exothermic
(B) endothermic
(C) explosive
(D) none of these

Sep 14, 2022 at 08:36 PM

Multiple Choice

ID- 13001

47. Chromatography is a useful method for purification of elements which are

(A) very reactive
(B) available in minute quantities
(C) present in abundance
(D) high electropositive

Sep 14, 2022 at 08:39 PM

Multiple Choice

ID- 13057

48. A number of elements are available in earth's crust but most abundant elements are ..........

(A) Al and Fe
(B) Al and Cu
(C) Fe and Cu
(D) Cu and Ag

Sep 15, 2022 at 05:52 AM

Multiple Choice

ID- 13058

49. Zone refining is based on the principal that ..........

(A) impurities of low boiling metals can be seperated by distillation
(B) impurities are more soluble in molten metal than in solid metal
(C) different components of a mixture are differently adsorbed on an adsorbent
(D) vapours of volatile compound acn be decomposed in pure metal

Sep 15, 2022 at 05:56 AM

Multiple Choice

ID- 13059

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

(A) FeS
(B) CO
(C) Cu₂S
(D) SO₂

Sep 15, 2022 at 05:58 AM

Multiple Choice

ID- 13060

51. In the metallurgy of aluminium

(A) Al³⁺ is oxidised to Al_(s)
(B) graphite anode is oxidised to carbon monoxide and carbon dioxide
(C) oxidation state of oxygen changes in the reaction at anode
(D) oxidation state of oxygen changes in the overall reaction involved in the process

Sep 15, 2022 at 06:01 AM

Multiple Choice

ID- 13061

52. Electrolytic refining is used to purity which of the following metals?

(A) Cu and Zn
(B) Ge and Si
(C) Zr and Ti
(D) Zn and Hg

Sep 15, 2022 at 06:03 AM

Multiple Choice

ID- 13062

BSEB, 2016 (C)

53. Dolamite mineral contains

(A) Mg
(B) Al
(C) Ca
(D) K

Sep 15, 2022 at 06:04 AM

Multiple Choice

ID- 13063

BSEB, 2016 (C)

54. Name important ore of aluminium—

(A) Bauxite
(B) Cryolite
(C) Croundum
(D) None

Sep 15, 2022 at 06:05 AM

Multiple Choice

ID- 13064

BSEB, 2016 (C)

55. NaOH is known as?

(A) Caustic soda
(B) Washing soda
(C) Caustic Potash
(D) All

Sep 15, 2022 at 06:06 AM

Multiple Choice

ID- 13065

BSEB, 2016 (C)

56. The formula of blue vitriol is:

(A) CuSO₄
(B) CuSO₄5H₂O
(C) CuSO₄2H₂O
(D) None

Sep 15, 2022 at 06:08 AM

Multiple Choice

ID- 13066

BSEB, 2017 (C)

57. Which of the following method is used for the concentration of zinc blende ore?

(A) Gravity separation process
(B) Magnetic separation process
(C) Froth floatation process
(D) None of these

Sep 15, 2022 at 06:09 AM

Multiple Choice

ID- 14560

58. $\ce{Impure Ni + 4CO->[60–80°C]}$ $\ce{Ni(CO)4->[180°C] Ni + 4CO}$ The above process of purification of the metal is known as

(A) van Arkel process
(B) pyrometallurgy
(C) Mond process
(D) zone refining

Sep 29, 2022 at 07:06 AM

General Principles and Processes of Isolation of Elements

Board » Bihar Board » Class 12th » English Medium » Science » Chemistry » Part-1 » Unit 6: General Principles and Processes of Isolation of Elements

Objective Questions (MCQs)

1. Which one of the following is not an ore of zinc?

2. Which of the following metals does not liberate hydrogen gas or reaction which acid?

3. Which of the following statement is true?

4. Mineral from which metal is extracted, is called:

5. Which of the following oxides is reduced in blast furnace?

6. When a metal oxide is heated with carbon, then metal is formed, MxOy + yC → xM + yCO, here carbon acts as:

7. The chief ore of copper is:

8. Concentration of sulphide ore is done by:

9. Malachite is an ore of:

10. Formula of copper pyrite is:

11. Ore of aluminium is:

12. Chief ore of Iron is:

13. A process of heating ore of a metal is excess of air below its melting point is called:

14. Copper metal is purified by which of the following method:

15. The oil uses as frothing agent in froth flotation process is:

16. Which of the following metals in not extracted by leaching?

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

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

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

20. Common impurities present in bauxite are:

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

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

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

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

25. Heating pyrites to remove sulphur is called:

26. Galena is an ore of:

27. In metallurgical process, aluminium acts as

28. Ellingham diagram represents charge of

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

30. In blast furnace iron oxide is reduced by

31. The process of smelting involves reduction of metal oxide with:

32. In a thermite process .......... is used as reducing agent.

33. Blister copper is:

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

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

36. Which of the following reactions takes place at higher temperature range (900 K - 1500 K) in blast furnace?

37. Which of the following metals is obtained by electrolytic reduction process?

38. Which of the following metals cannot be obtained by electrolysis?

39. Extraction of chlorine from brine is based on

40. .......... being highly reactive is used in the extraction of chromium and manganese

41. Which of the following is not a method of refining of metals?

42. In electro-refining of copper, some gold is deposited as

43. Which of the following is used as a method of purification for silicon?

44. Most electropositive metals are obtained from their ores by:

45. Carnallite on electrolysis gives

46. When Quicklime is immersed in water the reaction is:

47. Chromatography is a useful method for purification of elements which are

48. A number of elements are available in earth's crust but most abundant elements are ..........

49. Zone refining is based on the principal that ..........

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

51. In the metallurgy of aluminium

52. Electrolytic refining is used to purity which of the following metals?

53. Dolamite mineral contains

54. Name important ore of aluminium—

55. NaOH is known as?

56. The formula of blue vitriol is:

57. Which of the following method is used for the concentration of zinc blende ore?

58. $\ce{Impure Ni + 4CO->[60–80°C]}$ $\ce{Ni(CO)4->[180°C] Ni + 4CO}$ The above process of purification of the metal is known as

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