Please refer to Chapter 6 General Principles and Processes of Isolation of Elements MCQ Class 12 Chemistry with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 12 Chemistry. Students should refer to MCQ Questions for Class 12 Chemistry with Answers to score more marks in Grade 12 Chemistry exams. Students should read the chapter General Principles and Processes of Isolation of Elements and then attempt the following objective questions.

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

The General Principles and Processes of Isolation of Elements MCQ Class 12 Chemistry provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

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. Which of the following is an ore of tin ?           
(a) Carborundum
(b) Epsomite
(c) Cassiterite
(d) Spodumene

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

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

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

Question. Which of the following is chalcopyrite?         
(a) CuFeS₂
(b) FeS₂
(c) KMgCl3.6H₂O
(d) Al₂O3.2H₂O

Question. Haematite is the ore of             
(a) Pb
(b) Cu
(c) Fe
(d) Au

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

Question. Which one of the following is a mineral of iron ?         
(a) Malachite
(b) Cassiterite
(c) Pyrolusite
(d) Magnetite

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

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

Question. Froth floatation process is used for the metallurgy of             
(a) chloride ores
(b) amalgams
(c) oxide ores
(d) sulphide ores

Question. All ores are minerals, while all minerals are not ores because               
(a) the metal can’t be extracted economically from all the minerals
(b) minerals are complex compounds
(c) the minerals are obtained from mines
(d) all of these are correct

Question. Which one of the following is not a sulphide ore?           
(a) Magnetite
(b) Iron pyrites
(c) Copper glance
(d) Sphalerite

Question. Matrix is defined as –                 
(a) the unwanted foreign material present in the ore
(b) the flux added to remove the unwanted impurities from ore
(c) the slag formed as a result of the reaction of flux with gangue
(d) the material used in the reduction of metal oxide to metal

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

Question.The impurities associated with mineral used in metallurgy are called collectively?       
(a) Slag
(b) Flux
(c) Gangue
(d) Ore

Question. Cassiterite is concentrated by           
(a) levigation
(b) electromagnetic separation
(c) floatation
(d) liquefaction

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

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

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

Question. Which one of the following ores is not concentrated by froth floatation process?
(a) Copper pyrites
(b) Pyrargyrite
(c) Pyrolusite
(d) Zinc blende

Question. Electromagnetic separation is used in the concentration of             
(a) copper pyrites
(b) bauxite
(c) cassiterite
(d) cinnabar

Question. In the froth flotation process of concentration of ores, the ore particles float because they:           
(a) are light
(b) are insoluble
(c) have the surface which is not wetted easily
(d) have a constant electrical charge

Question. Main function of roasting is                   
(a) to remove volatile substances
(b) oxidation
(c) reduction
(d) slag formation

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. For which ore of the metal, froth floatation method is used for concentration?
(a) Horn silver
(b) Bauxite
(c) Cinnabar
(d) Heamatite

Question. Which of the following metal is leached by cyanide process ?               
(a) Ag
(b) Na
(c) Al
(d) Cu

Question. Roasting is generally done in case of the                 
(a) oxide ores
(b) silicate ores
(c) sulphide ores
(d) carbonate ores

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. In froth flotation process many chemicals (frother , collector, activator, and depressant) are used. Which of the following is a frother ?               
(a) CuSO₄
(b) NaCN+ alkali
(c) Pine oil
(d) Potassium xanthate

Question. Heating of pyrites in air for oxidation of sulphur is called             
(a) roasting
(b) calcination
(c) smelting
(d) slagging

Question. The role of calcination in metallurgical operations is           
(a) to remove moisture
(b) to decompose carbonates
(c) to drive off organic matter
(d) to decompose carbonates and drive off moisture and organic matter

Question. Froth flotation process is based on               
(a) wetting properties of ore particle
(b) specific gravity of ore particles
(c) magnetic properties of ore particles
(d) electrical properties of ore particles

Question. 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

Question. Function of the flux added during smelting is               
(a) to make ore porous
(b) to remove gangue
(c) to make reduction easier
(d) to precipitate slag

Question. The electrolytic method of reduction is employed for the preparation of metals that               
(a) are weakly electropositive
(b) are moderately electropositive
(c) are strongly electropositive
(d) form oxides

Question. Which of the following fluxes is used to remove acidic impurities in metallurgical process?               
(a) Silica
(b) Lime stone
(c) Sodium chloride
(d) Sodium carbonate

Question. Furnaces are lined with calcium oxide because             
(a) it gives off oxygen on heating
(b) it gives strong light on heating
(c) it is refractory and basic
(d) it is not affected by acids

Question. Refractory materials are generally used in furnaces because               
(a) they possess great structural strength
(b) they can withstand high temperature
(c) they are chemically inert
(d) they do not require replacement

Question. Process followed before reduction of carbonate ore is             
(a) calcination
(b) roasting
(c) liquation
(d) polling

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. When a metal is to be extracted from its ore and 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

Question. Cast iron is               
(a) made by melting pig iron with scrap iron and coke using hot air blast
(b) having slightly lower carbon content (about 3%) as compared to pig iron
(c) extremely hard and brittle
(d) All of the above statements are true

Question. Blister copper is             
(a) Impure Cu
(b) Cu alloy
(c) Pure Cu
(d) Cu having 1% impurity

Question. The furnace used to prepare commercial iron is lined with which of the following ?             
(a) Haematite
(b) Magnetite
(c) Ironpyrites
(d) Both (a) and (b)

Question. Aluminothermic process is used for the extraction of metals, whose oxides are
(a) fusible
(b) not easily reduced by carbon
(c) not easily reduced by hydrogen
(d) strongly basic

Question. In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with :             
(a) Copper (I) sulphide (Cu₂S)
(b) Sulphur dioxide (SO₂)
(c) Iron sulphide (FeS)
(d) Carbon monoxide (CO)

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