MCQs on general principal & processes of isolation of elements for class 12 | Pdf
MCQs on general principal & processes of isolation of elements for class 12 | Pdf
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MCQs on general principal & processes of isolation of elements
1) An alloys is
a) intermetallic compound
b) solid substance containing two or more metallic element
c) a solid which contains one non metal
d) solid which contains more than one non metal
Answer :b) solid substance containing two or more metallic element
2) Which of the following is correct
a) tin stone is magnetic in nature
b) wolframite is non magnetic m nature
c) wolframite is Fe WO4
d) cassiterite and rutile are sulphides of the metals
Answer: c) wolframite is Fe WO4
3) Which of the following is an are of iron?
a) Bauxite
b) Magmetite
c) Haematite
d) Smaltite
Answer :c) Haematite
4) Corundum is an ore of
a) boron
b) copper
c) aluminium
d) sodium
Answer :c) aluminium
5) The correct statement is.
a) cassiterite is an ore of tin
b) pyrolusite is the ore of iron
c) dolomite is the ore of zinc
d) galena is the ore of mercury
Answer :a) cassiterite is an ore of tin
6) Azurite is an ore of
a) Gold
b) Mercury
c ) Silver
d) copper
Answer :d) copper
7) An example of halide ores is:
a) Galena
b) Cryolite
c) Bauxite
d) Cinnabar
Answer :b) Cryolite
8) Which of the following is not an ore
a) Bauxite
b) Zinc blended
c) Malachite
d) Pig iron
Answer: d) Pig iron
9) which one of the following is a mineral of iron
a) magnetite
b) cassiterite
c) malachite
d) pyrolusite
Answer : a) magnetite
10) Which of the following is carbonate ore?
a) siderite
b) cuprite
c) calamine
d) both a and c
Answer : d) both a and c
11) and are ores of Aluminium.
a) bauxite and malachite
b) cuprite and calamine
c) bauxite and cryolite
d) cuprite and diaspore
Answer : c) bauxite and cryolite
12) In which of the following minerals, aluminium is not present?
a) cryolite
b) bauxite
c) fluorspar
d) fledspar
Answer : c) fluorspar
13) The ore having two different metal atoms is
a) copper pyrites
b) haematite
c) calamine
d) magnetite
Answer : a) copper pyrites
14) The chief ore oF zinc is
a) cryolite
b) calamine
c) calcite
d) cuprite
Answer : b) calamine
15) The main ore of aluminium is
a) alumina
b) potash alum
c) cryolite
d) bauxite
Answer : d) bauxite
16) In the aluminothermite process, aluminiùm acts
a) an oxidising agent
b) a reducing agent
c) a flux
d) gangue
Answer : b) a reducing agent
17) Which of the following are the correct matching of metals with the most commonly employed ores for their extraction?
a) Fe: Chalcocite: Al: Bauxite
b) Fe: Siderite; Al: Clay
c)Fe: Haematite; Al: corundum
d) Fe: Haematite; Al: Bauxite
Answer : d) Fe: Haematite; Al: Bauxite
18) calamine is precisely of
a) fe
b) Zn
c) Al
d) Cu
Answer : b) Zn
19) Alloy is an example of
a) solid sol
b) Aerosol
c) emulsion
d) gel
Answer :a) solid sol
20) Which one of the furmaces among the following can produce the highest temperature?
a) muffle furnace
b) blast furnace
c) reverberatory fumace
d) electric furnace
Answer : d) electric furnace
21) Which statement is correct?
a) gangues are carefully chosen to combine with the slag present in the ore to produce easily fusible flux to carry away 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
Answer : d) fluxes are carefully chosen to combine with the gangue present in the ore to produce easily fusible slag to carry away the impurities
22) The extraction IA and IIA group metals is done by
a) carbon reduction
b) aluminothermic process
c) metal displacement
d) electrolytic reduction
Answer : d) electrolytic reduction
23) The process of extracting, a metal in pure form from its ore is Known as
a) purification
b) refining
c) metallurgy
d) electrolysis
Answer :c) metallurgy
24) The froth flotation process is based upon
a) preferential adsoprtion of gangue particles oil
b) specific gravity of ore particles
c) preferential wetting of ore particles by oil
d) magnetic properties of gangue
Answer :c) preferential wetting of ore particles by oil
25) The main function ot roasting is
a) reduction
b) isolation
c) concentration
d) Oxidation
Answer :d) Oxidation
26) A common metal which can be used for the extraction of metals from their oxides by reduction is
a) Co
b) Al
c) C
d) Fe
Answer :b) Al
27) Sapphire is a mineral of
a) Hg
b) Cu
c) Zn
d) Al
Answer : d) Al
28) An important ore of tin is
a) cassiterite
b) chlorapatite
c) White tin
d) calamine
Answer :a) cassiterite
29) The most common constituent of steel is
a) S
b) O
c) C
d) Cr
Answer : c) C
30) Purest form ot iron is
a) cast iron
b) hard steel
c) stainless steel
d) wrought iron
Answer : d) wrought iron
31) The most abundant metal in earth crust is
a) Fe
b) O
c) Si
d) Al
Answer : d) Al
32) Which of the following is not an ore of iron?
a) magnetite
b) limonite
c) siderite
d) cerrusite
Answer : d) cerrusite
33) cassiterite is an ore of
a) Ag
b) Sn
c) Cu
d) Fe
Answer : b) Sn
34) smelting is the Process of reducution of metal oxide by
a) C
b) H
c) CO
d) Al
Answer : a) C
35) Which of the following is not an ore of aluminium?
a) feldspar
b) corrundum
c) bauxite
d) carnallite
Answer :d) carnallite
36) Blister copper is
a) Pure copper
b) Alloy of coppeer
C) Copper containing some impurity
d) Ore of copper
Answer :C) Copper containing some impurity
37) The ore of copper is
a) fledser
b) Dolonmite
c) malachite
d Haenmatite
Answer :c) malachite
38) Which of the following metals does not occur as oxide?
a) iron
b) Aluminium
C) Copper
d) sodium
Answer : d) sodium
39) which of the following is an ore of two metals?
a) limonite
b) dolomite
C) siderite
d) malachite
Answer : b) dolomite
40) which of the following contains both Ca and Mg?
a) gypsum
b) chalk
C) limestone
d) Dolomite
Answer :d) Dolomite
41) The removal of impurities from a
molten mass is called
a) calcination
b) levigation
c) refining
d) slagging
Answer : d) slagging
42) silica is an
a) acidic flux only
b) gangue only
c) basic flux only
d) both gangue and acidic flux
Answer : d) both gangue and acidic flux
43) Pn and Sn are extracted from their chiet ore by
a) carbon reduction and self reduction
b) self reduction and carbon reduction
c) electrolysis and self reducton
d) selt reduction and electrolysis
Answer : b) self reduction and carbon reduction
44) During smelting, an additional substance i called which combines with impurity to form fusible mass.
a) ore
b) flux
c) slag
d) gangue
Answer :b) flux
45) The ores that are concentrated by flotation method are
a) carbonates
b) sulphides
c) oxides
d) phosphates
Answer :b) sulphides
46) Which of the following is gangue?
a) waste material left after concentration
b) waste material left after purification of metal
c) waste material after electrolysis
d) waste material present in ore to be
removed during concentration
Answer : d) waste material present in ore to be removed during concentration
47) What type of flux is used when the gangue is acidic ?
a) acidic
b) basic
c) neutral
d) alcoholic
Answer :b) basic
48) Which of the following is correct?
a) gangue + FluX= slag
b) froth + slag =gangue
c) gangue + slag= flux
d) flux + slag=gangue
Answer : a) gangue + FluX= slag
49) A naturally occuring metal compoind from which the metal is not extracted is known as
a) slag
b) Ore
c) gangue
d) mineral
Answer : d) mineral
50) The extraction of metals from oxide ore involves
a) decarboxilation
b) hydrolysis
c) electrolysis
d) reduction
Answer : d) reduction
51) The impurities associated with mineral used in metallurgy are called collectively
a) slag
b) gangue
c) flux
d) froth
Answer : b) gangue
52) The metallurgical process in which a metal is obtained in fused state is called
a) calcination
b) roasting
C) froth flotation
d) smelting
Answer : d) smelting
53) The formula of haematite is
a) Fe3O4
b) Fe2O3
C) FeS2
d) FeCO3
Answer : b) Fe2O3
54) The colour of zinc sulphide is
a) black
b) yellow
C) white
d) brown
Answer : C) white
55) Bauxite is an oxide mineral of
a) Br
b) Ba
C) B
d) Al
Answer : d) Al
56) Hall’s process is employed for purifying bauxite containing
a) sand
b) silicone dioxide
C) iron oxide
d) silicates
Answer : C) iron oxide
57) Copper metal is refined by
a) cupellation
b) poling
C) bessemerisation
d) liquation
Answer : b) poling
58) Use of electrolysis is
a) electrorefinning
b) removal of electrons
C) electroplating
d) both a and c
Answer : d) both a and c
59) The incorrect statement among the following
a) hydrogen is used to reduce NiO
b) zirconium is refined by van Arkel method
c) the sulphide ore galena is concentrated
by froth flotation method
d) in the metallurgy of iron, the fluX used is SiO2
Answer : d) in the metallurgy of iron, the fluX used is SiO2
60) In zone refining method, the molten zone
a) contains purified metal only
b) contains impurities
C) contains more impurity than the original metal
d) move to either side
Answer :C) contains more impurity than the original