MCQ Chapter 6 General Principles and Processes of Isolation of Elements Class 12 Chemistry

Please refer to General Principles and Processes of Isolation of Elements MCQ Questions Class 12 Chemistry below. These MCQ questions for Class 12 Chemistry with answers have been designed as per the latest NCERT, CBSE books and syllabus issued for the current academic year. These objective questions for General Principles and Processes of Isolation of Elements will help you to prepare for the exams and get more marks.

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

Please see solved MCQ Questions for General Principles and Processes of Isolation of Elements in Class 12 Chemistry. All questions and answers have been prepared by expert faculty of standard 12 based on latest examination guidelines.

Question. Which one of the following metals, is extracted on smelting of its ore in blast furnace?
(a) Iron
(b) Sodimn
(c) Potassium
(d) Magnesium     

Question. The extraction of which of the following metals involves bessemerisation? 
(a) Fe
(b) Ag
(c) Al
(d) Cu   

Question. Gold is extracted by hydrometallurgical process, based onits property 
(a) of being electropositive
(b) of being less reactive
(c) to form complexes which are water soluble
(d) to form salts which are water soluble 

Question. Extraction of zinc from zinc blende is achieved by
(a) electrolytic reduction 
(b) roasting followed by reduction with carbon
(c) roasting followed by reduction with another metal
(d) roasting followed by self reduction       

Question. During the extraction of copper, the impurity (FeS) is removed as slag by mixing the contaminated copper ore with silica and coke. The molecular formula of slag is
(a) FeSiO₃
(b) Fe₂O₃ 
(c) FeSi (solid)
(d) FeSi     

Question. Hydrometallurgy is based on
(a) calcination
(b) roasting
(c) oxidation  
(d) reduction       

Question. The chief impurity present in red bauxite is
(a) SiO₂
(b) Fe₂O₃
(c) K₂SO₄
(d) NaF       

Question. Sulphide ores are common for metals
(a) Ag, Cu and Pb
(b) Ag, Cu and Sn
(c) Ag, Mg and Pb
(d) Al, Cu and Pb     

Question. Which of the following is an oxide ore? 
(a) Malachite
(b) Haematite
(c) Copper glance
(d) Zinc blende     

Question. Which one of the following statements is false? 
(a) During roasting, moisture is removed from the ore
(b) The ore is freed from almost all non-metallic
(c) Calcination of ore is carried out in the absence of any blast of air
(d) The concentrated zinc blende is subjected to calcination during its extraction by pyrometallurgy       

Question. In aluminothemuc process, Al is used as a/an 
(a) reducing agent
(b) oxidising agent
(c) catalyst
(d) electrolyte   

Question. Bauxite ore is made up of Al₂O₃ + SiO₂ + TiO₂ + Fe₂O₃ . This ore is treated with cone. Na OH solution at 500 Kand 35 bar pressure for few hours and filtered hot. In the filtrate, the species present are 
(a) NaAl(OH)₄
(b) Na₂Ti(OH)₆
(c) Na[Al(OH)₄ ] and Na₂SiO₃
(d) Na₂SiO₃       

Question. Which of the following is true for electrolytic refining?
(a) Pure metal is anode and impure metal is cathode
(b) Pure metal is cathode and impure metal is anode
(c) Both are anode
(d) Both are cathode     

Question. One of the following metals forms a volatile compound and this property is taken advantage for its extraction. This metal is
(a) iron
(b) nickel
(c) cobalt
(d) tungsten     

Question. In metallurgical process, for which metal carbon is used for reduction of metal oxides? 
(a) Na
(b) Ag
(c) Fe
(d) Hg   

Question. In the electrolytic refining of zinc,
(a) graphite is at the anode
(b) the impure metal is at the cathode
(c) the metal ions get reduced at the anode
(d) acidified zinc sulphate is the electrolyte   

Question. The purest zinc is obtained by 
(a) electrolytic refining
(b) zone refining
(c) van Arkel method
(d) Mond’s process   

Question. Aluminium metal is refined by 
(a) Serpeck’s process
(b) Baeyer’s process
(c) Hall’s process
(d) Hoope’s process       

Question. Identify the ore not containing iron. 
(a) Limonite
(b) Siderite
(c) Carnallite
(d) Chalcopyrites     

Question. Which one of the following is the chief ore of copper?
(a) Galena
(c) Sphalerite
(b) Copper pyrites
(d) Siderite     

Question. Argentite is an ore of
(a) Fe
(b) AI
(c) Cu
(d) Ag   

Question. Calamine is
(a) CaCO₃
(b) MgCO₃
(c) ZnCO₃
(d) CaCO₃ + CaO     

Question. Extraction of metal from the ore cassiterite involves
(a) carbon reduction of an oxide ore
(b) self-reduction of a sulphide ore
(c) removal of copper impurity
(d) removal of iron impurity     

Question. Which one of the following ores is best concentrated by froth floatation method? 
(a) Magnetite
(b) Cassiterite
(c) Galena
(d) Malachite     

Question. Observe the following statements regarding purification of bauxite.
I. During Hall’s process, silica is removed as Si (vapour).
II. Bauxite ore contaminated with FeiO₃ is purified in Baeyer’s process.
III. During Serpeck’s process, AIN is formed. The correct answer is
(a) I, II and III
(b) I and II
(c) I and III
(d) II and III     

Question. Refining of impure copper with zinc impurity is to be done by electrolysis using electrodes as 

Question. Upon heating with Cu₂S, the reagent(s) that given copper metal is/are 
(a) CuFeS₂
(b) CuO
(c) Cu₂O
(d) CuSO₄     

Question. The method of zone refining of metals is based on the principle of
(a) greater noble character of the solid metal than that of the impurity
(b) greater solubility of the impurity in the molten state than in the solid
(c) greater mobility of the pure metal than that of impurity 
(d) higher melting point of the impurity than that of the pure metal     

Question. Aluminium is obtained by 
(a) reducing Al₂O₃ with coke
(b) electrolysing Al₂O₃ dissolved in Na₃ AIF₆
(c) reducing Al₂O₃ with chromium
(d) heating alumina with cryolite     

Question. Composition ofazmite mineral is
(a) CuCO₃ • CuO
(b) Cu(HCO₃)₂ · Cu(OH)₂
(c) 2CuCO₃ · Cu(OH)₂
(d) CuCO₃ · 2 Cu(OH)₂   

Question. Cyanide process is used for extraction of
(a) Ag
(b) Ni
(c) Pt
(d) Zn       

Question. During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’. These are 
(a) Fe and Ni
(b) Ag and Au
(c) Pb and Zn
(d) Se and Ag     

Question. In the electrolytic method for obtaining aluminium from purified bauxite, cryolite is added to
(a) minimise the heat loss due to radiation 
(b) protect aluminium produced from oxygen
(c) dissolve bauxite and render it conductor of electricity
(d) lower the melting point of bauxite     

Question. Which one of the following ores is an ore of copper?
(a) Argentite
(b) Haematite 
(c) Malachite
(d) Calamine       

Question. From the Ellingham graph on carbon, which of the following statements is false? 
(a) CO reduces Fe₂O₃ to Fe at less than 983 K
(b) CO is less stable than CO₂ at more than 983 K
(c) CO reduces Fe₂O₃ to Fe in the reduction zone of blast furnace
(d) CO₂ is more stable than CO at less than 983 K      

Question. On igniting Fe₂O₃ at 1400°C, the product obtained is
(a) Fe₂O₃ melt
(b) FeO 
(c) Fe₃O₄
(d) metallic iron     

Question. In the cyanide extraction process of silver from argentite ore, the oxidising and reducing agents used are
(a) O₂ and CO
(b) O₂ and Zn dust
(c) HNO₃ and Zn dust  
(d) HNO₃ and CO     

Question. Impurities of Cu and Ag from gold are removed by
(a) boiling impure gold with di!. H₂SO₄ 
(b) boiling impure gold with cone. H₂ SO4
(c) electrolytically
(d) Both (b) and (c)   

Question. Identify the reaction that does not take place in a blast furnace. 
(a) CaCO₃ → CaO + CO₂
(b) CaO + SiO₂ → CaSiO₃
(c) 2Fe₂O₃ + 3C → 4Fe + 3CO₂
(d) CO₂ + C → 2CO   

Question. Metallic silver may be obtained from AgCl by
(a) heating it in the current of H₂ 
(b) fusing it with sand
(c) treating with carbon monoxide
(d) fusing it with Na₂CO₃       

Question. Gravity separation process is used for the concentration of 
(a) calamine
(b) haematite
(c) chalcopyrite
(d) bauxite       

Question. In Mac Arthm Forrest method, silver is extracted from the solution of Na [Ag(CN)₂ ] by the use of 
(a) Fe
(b) Mg
(c) Cu
(d) Zn   

Question. Which of the following metal is correctly matched with its ore? 

Question. Siderite is an ore of 
(a) Cu
(b) Al
(c) Ag
(d) Fe       

Question. Which ore contains both iron and copper? 
(a) Cuprite
(b) Chalcocite
(c) Chalcopyrite
(d) Malachite     

Question. Carbon cannot be used in the reduction of Al₂O₃ because 
(a) it is an expensive proposition 
(b) the enthalpy of formation of CO₂ is more than that of Al₂O₃
(c) pure carbon is not easily available
(d) the enthalpy of formation of Al₂O₃ is too high     

Question. Which one of the following metals is extracted by a carbon reduction process? 
(a) Copper
(b) Iron
(c) Aluminium
(d) Magnesium     

Question. Blister copper is
(a) impure Cu
(b) Cu alloy
(c) pure Cu
(d) Cu having 1% impurities     

Question. In blast furnace, iron oxide is reduced by
(a) hot blast of air
(b) carbon monoxide
(c) carbon
(d) silica       

Question. In electrorefining of copper, some gold is deposited as
(a) cathode
(b) e lectrode
(c) cathode mud
(d) anode mud     

Question. In the extraction of Fe from Fe₂O₃ , the reducing agent used is
(a) C
(c) electrolytic reduction
(b) Al
(d) Cu       

Question. The temperature of the slag zone in the metallurgy of iron using blast furnace is
(a) 1200- 1500°C
(b) 1500-1600°C
(c) 400-700°C
(d) 800-1000°C   

Question. When copper pyrites is roasted in excess of air, a mixture of CuO + FeO is formed. FeO is present as impurities. This can be removed as slag during reduction of CuO. The flux added to form slag is 
(a) SiO₂ , which is an acidic flux
(b) limestone, which is a basic flux
(c) SiO₂ , which is a basic flux
(d) Cao, which is a basic flux     

Question. Heating mixture of Cu₂O and Cu₂ Swill give
(a) Cu₂ SO₃
(b) CuO + CuS
(c) Cu+ SO₃
(d) Cu+ SO₂         

Question. Identify the reaction that does not take place during the smelting process of extraction. 
(a) 2FeS + 3 O₂ → 2 FeO + 2 SO₂ ↑
(b) Cu₂O + FeS → Cu₂S + FeO
(c) 2 Cu₂S + 3 O₂ → 2 Cu₂O + 2 SO₂ ↑
(d) FeO+ SiO₂ → FeSiO₃   

Question. During the extraction of gold, the following reactions take place
      Au+ CN^– + H₂O →^O₂ X
                   X + Zn → Y + Au
X and Y respectively, are
(a) [Au (CN)₂ r and [Zn (CN)₆ J^4-
(b) [Au (CN)₄]^2- and [Zn (CN)₄]^2-
(c) [Au (CN)₄]^3- and [Zn (CN)₄]^2-
(d) [Au (CN)₂]^–and [Zn(CN)₄]^2-