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Class 12 Chemistry  MCQ Questions of General Principles and Processes of Isolation of Elements with Answers?

Answer 1

We have provided here Chemistry General Principles and Processes of Isolation of Elements Class 12 MCQ Questions with Answers to help students understand the concept very well. Class 12 Chemistry MCQ Questions of General Principles and Processes of Isolation of Elements with Answers cause you to feel sure about responding to the questions in the test and expands your scores to high.

Practice more consistently with these Chemistry target questions on the air contamination and work regarding your matter information and problem-solving abilities alongside using time productively. Science is the scoring paper in the examinations. Here, you will find the MCQ Questions for class 12 Chemistry all Concepts according to the most recent syllabus. 

Practice MCQ Question for Class 12 Chemistry chapter-wise

1. Concentration of sulphide ore is done by

(a) froth flotation process
(b) electrolysis
(c) roasting
(d) None of these

2. Malachite is an ore of

(a) iron
(b) copper
(c) zinc
(d) Sliver

3. Ore of aluminium is

(a) bauxite
(b) hematite
(c) dolomite
(d) None of these

4. 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

(a) metallurgy
(b) leaching
(c) froth floatation process
(d) gravity separation.

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

(a) coconut oil
(b) castor oil
(c) palmitic oil
(d) pine oil

6. Common impurities present in bauxite are

(a) CuO
(b) ZnO
(c) CaO
(d) SiO₂

7. An ore of tin containing FeCrO₄ is concentrated by

(a) gravity separation
(b) magnetic separation
(c) froth floatation
(d) leaching

8. The significance of leaching in the extraction of aluminium is

(a) it helps removing the impurities like SiO₂, Fe₂O₃ etc. from the bauxite ore
(b) it converts the ore into oxide
(c) it reduces melting point of the ore
(d) it eliminates water from bauxite

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

(a) Mg
(b) Al
(c) Cu
(d) Zn

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

(a) Cr
(b) Mn
(c) Fe
(d) Mg

11. Heating pyrites to remove sulphur is called

(a) smelting
(b) calcination
(c) liquation
(d) roasting

12. Process of heating ore is air to remove sulphur is: 

(a) Calcination 
(b) Roasting 
(c) Smelting 
(d) None of these

13. In metallurgical process, aluminium acts as

(a) an oxidising agent
(b) a reducing agent
(c) acidic flux
(d) basic flux

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

(a) flux
(b) slag
(c) reducing agent
(d) gangue

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

(a) Zn
(b) Al
(c) Mn
(d) Fe

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

(a) CaSiO₃
(b) FeSiO₃
(c) MgSiO₃
(d) ZnSiO₃

17. Cinnabar is an ore of

(a) Hg
(b) Ag
(c) Sn
(d) Al

18.  Which of the following is an ore of tin?

(a) Carborundum
(b) Epsomite
(c) Cassiterite
(d) Spodumene

19. The most abundant element in the earth’s crust (by weight) is

(a) Si
(b) Al
(c) O 
(d) Fe

20. Cassiterite is an ore of

(a) Mn
(b) Ni
(c) Sb
(d) Sn

21. Galena is an ore of

(a) Pb
(b) Hg
(c) Zn
(d) None of these

22. The method of concentrating the ore which makes use of the difference in density between ore and impurities is called

(a) levigation
(b) leaching
(c) magnetic separation
(d) liquifaction

23. General method for the extraction of metal from oxide ore is

(a) carbon reduction
(b) reduction by aluminium
(c) reduction by hydrogen
(d) electrolytic reduction

24. Blast furnace is used in the metallurgy of:

(a) Al
(b) Fe
(c) gold
(d) Ag

25. The inner lining of a blast furnace is  made up of:

(a) graphite bricks
(b) silica  bricks
(c) fire clay bricks
(d) basic bricks

Answer 2

1. Answer : (a) froth flotation process

Explanation: The froth floatation process is a process that is used industrially for the concentration of sulphide ores of various minerals.

2. Answer : (b) copper

Explanation: Malachite, a minor ore but a widespread mineral of copper, basic copper carbonate, Cu₂CO₃(OH)₂. Because of its distinctive bright green colour and its presence in the weathered zone of nearly all copper deposits, malachite serves as a prospecting guide for that metal.

3. Answer : (a) bauxite

Explanation: Bauxite ore is the world's primary source of aluminum. The ore must first be chemically processed to produce alumina (aluminum oxide).

4. Answer : (c) froth floatation process

Explanation: 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. froth floatation process.

5. Answer : (d) pine oil

Explanation: So, the oil used as a frothing agent in the Froth flotation process is pine oil.

6. Answer : (d) SiO₂

Explanation: The major impurities in Bauxite are iron oxides (goethite & hematite), silicon dioxide, the clay mineral kaolinite as well as small amounts of anatase.

7. Answer : (b) magnetic separation

Explanation: An ore of tin-containing FeCrO₄ is concentrated by magnetic separation as FeCrO₄ is ferromagnetic in nature. Magnetic separation based on differences in magnetic properties of the ore components.

8. Answer : (a) it helps removing the impurities like SiO₂, Fe₂O₃ etc. from the bauxite ore

Explanation: In the extraction of aluminium, the significance of leaching is to concentrate pure alumina (Al₂O₃) from bauxite ore.In this process, hydrated Al₂O₃ gets precipitated and sodium silicate remains in the solution.

9. Answer : (c) Cu

Explanation: Copper matte is put in a silica-lined converter to remove the remaining FeO and FeS present in the matte as slag (FeSiO₃).

10. Answer : (d) Mg

Explanation: Among the metals Cr, Fe, Mn, Ti, Ba, and Mg, the one that cannot be obtained by reduction of metal oxide by aluminium is. Mg reacts with C to form Magnesium carbide.

11. Answer : (d) roasting

Explanation: Heating pyrites to remove sulphur is called roasting. Pyrites are metal sulphide ores. Upon heating in presence of air, metal pyrites are converted to metal oxides and sulphur is removed as sulphur dioxide gas.

12. Answer : (b) roasting

Explanation: Heating pyrites to remove sulphur is called roasting. Pyrites are metal sulphide ores. Upon heating in presence of air, metal pyrites are converted to metal oxides and sulphur is removed as sulphur dioxide gas.

13. Answer : (b) a reducing agent

Explanation: Aluminium acts as reducing agent because when it releases electrons those electrons will go to some other stuff and reduce it, when it comes to metallurgy aluminium is used to reduce iron oxide into iron and itself getting oxidized to aluminium oxide (The thermite reaction).

14. Answer : (a) flux

Explanation: CaCO₃ is added as flux. It decomposes to give CaO which reacts with SiO₂ to form slag.

15. Answer : (b) Al

Explanation: The reducing agent used in thermite process is Aluminium.

16. Answer : (a) CaSiO₃

Explanation: In the metallurgy of iron, limestone (CaCO₃​) acts as a flux and forms calcium silicate CaSiO₃​(slag).

17. Answer : (a) Hg

Explanation: Cinnabar is mined as the major ore of mercury. The ore of cinnabar is squeeze plus made warm toward let mercury goes as a vapour.

18. Answer : (c) Cassiterite

Explanation: Cassiterite is the main ore of Tin. It is a mineral of tin oxide, SnO₂.

19. Answer : (c) O 

Explanation: The most abundant element in the earth's crust by weight is oxygen.

20. Answer : (d) Sn

Explanation: Cassiterite, also called tinstone, heavy, metallic, hard tin dioxide (SnO₂) that is the major ore of tin. It is colourless when pure, but brown or black when iron impurities are present.

21. Answer : (a) Pb

Explanation: Galena, also called lead glance, a grey lead sulfide (PbS), the chief ore mineral of lead.

22. Answer : (a) levigation

Explanation: Levigation is based on the difference in densities of the metallic ore and gangue particles. Powdered ore is treated with a stream of running water when the lighter gangue particles are washed away and heavier ore particles are left behind.

23. Answer : (a) carbon reduction

Explanation: The common method of extraction of metals from oxide ore involves reduction with carbon. 

24. Answer : (b) Fe

Explanation: Blast furnaces are used to produce pig iron from iron ore for subsequent processing into steel, and they are also employed in processing lead, copper, and other metals.

25. Answer : (c) fire clay bricks

Explanation: The inner lining of blast furnace is made from Fire Clay bricks. These are highly refractory in nature and does not melt at even huge temperature. The main components of fire clay bricks are Silica and alumina.

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