Students of class 12 Chemistry should refer to MCQ Questions Class 12 Chemistry General Principles and Processes of Isolation of Elements with answers provided here which is an important chapter in Class 12 Chemistry NCERT textbook. These MCQ for Class 12 Chemistry with Answers have been prepared based on the latest CBSE and NCERT syllabus and examination guidelines for Class 12 Chemistry. The following MCQs can help you to practice and get better marks in the upcoming class 12 Chemistry examination

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

MCQ Questions Class 12 Chemistry General Principles and Processes of Isolation of Elements provided below have been prepared by expert teachers of grade 12. These objective questions with solutions are expected to come in the upcoming Standard 12 examinations. Learn the below provided MCQ questions to get better marks in examinations.

Question. Heating of an ore in the absence of air below the melting point is called ________________.
(a) leaching
(b) roasting
(c) smelting
(d) calcination

Question. Sulphide ores of metals are usually concentrated by froth floatation. Which one of the following sulphide ores is an exception and concentrated by leaching?
(a) Copper pyrite
(b) Argentite
(c) Galena
(d) Sphalerite

Question. Galena is an ore of
(a) Pb
(b) Hg
(c) Zn
(d) None of these

Question. Which of the following is not a basic flux?
(a) CaCO3
(b) CaO
(c) SiO2
(d) MgO

Question. Calamine is an ore of
(a) Cu
(b) Fe
(c) Zn
(d) Al

Question. 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

Question. Extraction of gold and silver involves leaching the metal with CN– ion. The metal is recovered by ________________. 
(a) displacement of metal by some other metal from the complex ion.
(b) roasting of metal complex.
(c) calcination followed by roasting.
(d) thermal decomposition of metal complex.

Question. In aluminothermic process, Al acts as ________________.
(a) an oxidising agent
(b) a flux
(c) a reducing agent
(d) a solder

Question. In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with
(a) iron(II) sulphide
(b) carbon monoxide
(c) copper(I) sulphide
(d) sulphur dioxide

Question. Which of the following reactions taking place in the blast furnace during extraction of iron is endothermic?
(a) C O2 CO2 +
(b) 2C O2 2CO +
(c) Fe2O3 3CO 2Fe 3CO2 + +
(d) CaCO3 CaO CO2 +

Question. Sulphide ores are generally concentrated by
(a) froth floatation
(b) roasting
(c) gravity
(d) reduction of carbon

Question. The metal always found in the free states is
(a) Au
(b) Ag
(c) Cu
(d) Na

Question. While extracting an element from its ore, the ore is grounded and leached with dil. potassium cyanide solution to form the soluble product potassium argento cyanide. The element is
(a) Lead
(b) Chromium
(c) Manganese
(d) Silver

Question. In the blast furnace, at lower temperature range of 500–800 K
(a) Fe2O3 is first reduced to Fe3O4 and then to FeO
(b) Fe2O3 is first converted to FeO and then to Fe3O4
(c) Fe3O4 is converted to Fe2O3
(d) Fe3O4 is reduced to FeO

Question. Which one of the following is an ore of silver ?
(a) Argentite
(b) Stibnite
(c) Haematite
(d) Bauxite

Question. Cinnabar is an ore of
(a) Hg
(b) Cu
(c) Pb
(d) Zn

Question. An example of an oxide ore is
(a) Bauxite
(b) Malachite
(c) Zinc blende
(d) Feldspar

Question. When copper ore is mixed with silica, in a reverberatory furnace copper matte is produced. The copper matte contains ________________.
(a) sulphides of copper (II) and iron (II)
(b) sulphides of copper (II) and iron (III)
(c) sulphides of copper (I) and iron (II)
(d) sulphides of copper (I) and iron (III)

Question. 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.

Question. In the extraction of aluminium by Hall-Heroult process, purified Al2O3 is mixed with CaF2 to:
(a) lower the melting point of Al2O3.
(b) increase the conductivity of molten mixture.
(c) reduce Al3+ into Al(s).
(d) acts as catalyst.

Question. Which method is useful for producing semiconductors and other methods of very high purity?
(a) Vapour phase refining
(b) Distillation
(c) Electrolyte refining
(d) Zone refining

Question. Which of the following options are correct? 
(a) Cast iron is obtained by remelting pig iron with scrap iron and coke using hot air blast.
(b) In extraction of silver, silver is extracted as cationic complex.
(c) Nickel is purified by zone refining.
(d) Zr and Ti are purified by van Arkel method.

Question. Which of the following is known as ‘the Wonder Material of the Orient’?
(a) Glass
(b) Graphene
(c) Iron
(d) Indian charcoal

Question. 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

Question. The salt which is least likely to be found in minerals is
(a) sulphide
(b) chloride
(c) nitrate
(d) sulphate

Question. The natural materials from which an element can be extracted economically are called
(a) ores
(b) minerals
(c) gangue
(d) None of these

Question. The most abundant metal on the surface of the earth is
(a) Fe
(b) Al
(c) Ca
(d) Na

Question. The most abundant element in the earth’s crust (by weight) is
(a) Si
(b) Al
(c) O
(d) Fe

Question. Malachite is an ore of
(a) iron
(b) copper
(c) mercury
(d) zinc

Question. If the impurities in a metal has a greater affinity for oxygen and is more easily oxidised than the metal, then the purification of metal may be carried out by
(a) distillation
(b) zone refining
(c) electrolytic refining
(d) cupellation

Question. Germanium of very high purity is obtained by
(a) liquation
(b) vapour phase refining
(c) distillation
(d) zone refining

Question. What is anode mud?
(a) Fan of anode
(b) Metal of anode
(c) Impurities collected at anode in electrolysis during purification of metals
(d) All of these

Question. Cassiterite is an ore of
(a) Mn
(b) Ni
(c) Sb
(d) Sn

Question. In the extraction of chlorine by electrolysis of brine ________________. 
(a) oxidation of Cl– ion to chlorine gas occurs.
(b) reduction of Cl– ion to chlorine gas occurs.
(c) for overall reaction DGo has negative value.
(d) a displacement reaction takes place.

Question. Electrolytic refining is used to purify which of the following metals? 
(a) Cu and Zn
(b) Ge and Si
(c) Zr and Ti
(d) Zn and Hg

Question. Zone refining is based on the principle that ________________.
(a) impurities of low boiling metals can be separated 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 can be decomposed in pure metal.

Question. Leaching is a process of
(a) reduction
(b) concentration
(c) refining
(d) oxidation

Question. Which one of the following ores is concentrated by chemical leaching method?
(a) Galena
(b) Copper pyrite
(c) Cinnabar
(d) Argentite

Question. Which of the following pairs of metals is purified by van Arkel method ?
(a) Ga and In
(b) Zr and Ti
(c) Ag and Au
(d) Ni and Fe

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

Question. Method used for obtaining highly pure silicon which is used as a semiconductor material, is
(a) oxidation
(b) electrochemical
(c) crystallization
(d) zone refining

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

Question. Which one of the following does not occur as sulphide ore?
(a) Zn
(b) Cr
(c) Ag
(d) Fe

Question. Pyrolusite is a/an
(a) oxide ore
(b) sulphide ore
(c) carbide ore
(d) Not an ore

Question. Sulphide ores of metals are usually concentrated by froth flotation process. Which one of the following sulphide ores offer an exception and is concentrated by chemical leaching?
(a) Galena
(b) Copper pyrite
(c) Sphalerite
(d) Argentite

Question. Which of the following statements is correct ?
(a) Gangues are carefully chosen to combine with the slag present in the ore to produce easily fusible flux to carry way the impurities
(b) Slags are carefully chosen to combine with the flux present in the ore to produce easily fusible gangue to carry away the impurities
(c) Gangues are carefully chosen to combine with the flux present in the ore to produce easily fusible slag to carry away the impurities
(d) Fluxes are carefully chosen to combine with the gangue present in the ore to produce easily fusible slag to carry away the impurities

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) Sn and Ag

Question. The process of zone refining is used in the purification of
(a) Si
(b) Al
(c) Ag
(d) Cu

Question. Copper can be extracted from
(a) Kupfernical
(b) Dolomite
(c) Malachite
(d) Galena

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

We hope the above multiple choice questions for Class 12 Chemistry for Chapter 6 General Principles and Processes of Isolation of Elements provided above with answers based on the latest syllabus and examination guidelines issued by CBSE, NCERT and KVS are really useful for you. General Principles and Processes of Isolation of Elements is an important chapter in Class 12 as it provides very strong understanding about this topic. Students should go through the answers provided for the MCQs after they have themselves solved the questions. All MCQs have been provided with four options for the students to solve. These questions are really useful for benefit of class 12 students. Please go through these and let us know if you have any feedback in the comments section.