Chapter 6 General Principles and Process of Isolation of Elements MCQs for Class 12 Chemistry
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Q 1.: Which one of the following is a mineral of Iron ?
Q 2.: Which one of the following does not occur as sulphide ore ?
Q 3.: German silver is an alloy of
(A) Cu, Zn and Ni
(B) Cu, Sn, Ag
(C) Cu, Sn and Zn
(D) Cu, Sn and Ni
Q 4.: Calcium ammonium nitrate is Known as
(A) Chile salt petre
(B) Thomas slag
(D) Nangal fertilizer
Q 5.: Which of the following is not an ore of magnesium ?
Q 6.: The formula of malachite ore is
Q 7.: The percentage of carbon in cast iron is
(A) 1 % – 2 %
(B) 2.5 % – 4.5 %
(C) 5 % – 7.5 %
(D) 8 % – 9.5 %
Q 8.: Brass is an alloy of
(A) Al and Zn
(B) Cu and Al
(C) Ni and Zn
(D) Cu and Zn
Q 9.: Heating of ore in the presence of air to remove sulphur impurities is called
Q 10.: In Mac-Arthur Forrest method, silver is extracted from the solution of Na[Ag(CN)2] by the use of
Q 11.: Which among the following metals is refined by electrolytic method ?
Q 12.: In alumino-thermite process ‘Al’ act as a/an
(A) Reducing agent
(B) Oxidising agent
Q 13.: The ore that is concentrated by froth floatation process is
Q 14.: The slag formed in the extraction of copper is
(C) Cu2O + FeS
(D) Cu2S + FeO
Q 15.: Sulphide ore of metals are usually concentrated by froth floatation process. Which one of the following sulphur ores offers an exception and is concentrated by chemical leaching ?
(D) Copper pyrite
Q 16.: Steel is heated to below red heat and then, cooled slowly. The process refers to
Q 17.: Auto reduction process is used in the extraction of
(A) Zn and Hg
(B) Cu and Hg
(C) Cu and Al
(D) Fe and Pb
Q 18.: Which of the following statement is incorrect ?
(A) A furnace lined with haematite is used to convert cast iron to wrought iron
(B) In vapour phase refining, metal should from a volatile compound
(C) Collector enhance the wettability of mineral particles during froth floatation
(D) Copper from its low-grade ore is extracted by hydrometallurgy
Q 19.: NaCN is sometime added in the froth floatation process as a depressant, when ZnS and PbS mineral are extracted because
(A) Pb(CN)2 is precipitated while no effect on ZnS
(B) PbS forms soluble complex Na2[Pb(CN)4] while ZnS forms froth
(C) ZnS forms soluble complex Na2[Zn(CN)4] while PbS forms froth
(D) NaCN is never added in froth floatation process
Q 20.: Which of the following element is present as the impurity to the maximum extent in the pig iron ?
Q 21.: Sphalerite is concentrated by
(A) Gravity separation
(B) Hydraulic washing
(D) Froth floatation
Q 22.: During smelting an additional substance is added which combines with impurities to form a fusible product which is known as
Q 23.: Gravity separation process is used for the concentration of
(D) None of these
Q 24.: Impurities of Cu and Ag from gold are removed by
(A) Boiling impure gold with dil. H2SO4
(B) Boiling impure gold with conc. H2SO4
(D) Both ‘B’ and ‘C’
Q 25.: Railway wagon axles are made by heating iron rods embedded in charcoal power. This process is known as
(A) Case hardening
Q 26.: In which process, fused sodium hydroxide is electrolysed for the extraction of sodium ?
(A) Cyanide process
(B) Castner’s process
(C) Down’s process
(D) Both ‘B’ and ‘C’
Q 27.: The purest zinc is made by
(A) Electrolytic refining
(B) Zone refining
(C) Van Arkel method
(D) Mond’s process
Q 28.: In zone refining method, the molten zone
(A) Contains purified metal only
(B) Contains impurity
(C) Contains more impurity than the original metal
(D) Moves to either side
Q 29.: Which of the following is the purest commercial form of iron ?
(A) Wrought iron
(B) Cast iron
(C) Pig iron
(D) Both ‘A’ and ‘C’
Q 30.: The mass of carbon anode consumed (Giving only CO2) in the production of 270 gm of Aluminium metal from bauxite by the Hall Heroult process
(A) 540 gm
(B) 270 gm
(C) 180 gm
(D) 90 gm
Q 31.: One of the following metals form a volatile compound and this property is taken advantage for its extraction. This metal is
Q 32.: Which of the following does not contain silicon
(D) Both ‘A’ and ‘b’
Q 33.: These are the extraction processes of silver except
(A) By reaction of silver sulphide with KCN and then reaction of soluble complex with Zn
(B) As a side product in electrolytic refining of copper
(C) By heating Na[Ag(CN)2]
(D) Parke’s process in which Zn is used to extract silver by solvent extraction from molten lead
Q 34.: Hydro-metallurgical process of extraction of metals is based on
(A) Complex formation
(D) Wetting property
Q 35.: The reagent used to extract silver from Ag2S is
Q 36.: For which metal is mond carbonyl method of refining is used ?
Q 37.: Which of the following pairs of metals is purified by Van-Arkel method.
(A) Ag and Au
(B) Zr and Ti
(C) Ga and In
(D) Ni and Fe
Q 38.: The method of zone refining of metals is based on the principle of
(A) Greater mobility of the pure metal than that of the impurity
(B) Higher melting point of the impurity than that of the pure metal
(C) Greater solubility of the impurity in the molten state than in the solid
(D) Greater noble character of the solid metal than that of the impurity
Q 39.: In Hall Heroult process, the main reagent is mixed with
(D) None of these
Q 40.: Which Froth Stabilisers are added in Froth Floation method ?
(D) Both (A) and (B)
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