Kerala Syllabus SAMAGRA SCERT SAMAGRA Question Pool for Class 10 English Medium Chemistry Production of Metals
Copper is refined electrolytically.The reaction occuring at the two electrodes are given.
Electrode 1 : Cu →Cu2+ + 2e
Electrode 2 : Cu2+ + 2e →Cu
Write whether Electrode 1 is anode or cathode.
Anode
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Metals like copper and silver are refined by using electrolytic method .
(a) Which is the anode used in refining of copper ?
(b) Write the equation of reaction occuring at anode and cathode during the refining of copper.
(a) Impure copper is used as anode.
(b) Anode : Cu →Cu2+ + 2e
Cathode : Cu2+ + 2e
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Which is the method used to refine tin?Why?
Liquation, Melting point of tin is less than that of the
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Different methods are used to convert the ores ZnCO3,Cu2S in to oxides.Write the appropriate methods to convert these ores.
ZnCO3 - Calcination
Cu2S -
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Leaching is a process in aluminium production.To which of the following
class does it belong ?
(a) Concentration of ore
(b) Extraction of metal
(c) Refining of metal
(d) Alloying
(a) Concentration of
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(a) Which is the method used to concentrate copper pyrites?
(b) What property of the ore is utilised here ?
(a) Froth floataton
(b)Density of ore is lighter than that of
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Which is an ore of iron ?
(Bauxite , Cryolite,Haematite ,Clay )
Haematite
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Which is not a basic metallurgical process ?
(a) Alloying
(b) Refining
(c) Concentration of ore
(d) Extraction of metal
(a) Alloying
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The method used to prepare a metal from an ore is known as ..................... .
Extraction of metal
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Minerals from which metals can be extracted easily are known as.................
Ore
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Which is not a mineral of aluminium ?
( Bauxite, Cryolite , Sand, Clay )
Sand
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Which among the following metals exists in the elemental state in nature?
(Magnesium , Sodium ,Gold ,Aluminium )
Gold
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The main gangue in iron ore is SiO2
(a) Name the important ore of iron ?
(hamatite/ Bauxite/Calamine/Tinstone)
(b) Name the substances used to remove gangue from an ore ? Which is the substance used to remove SiO2 from iron ore?
(a) Hamatite
(b)Flux,
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The figure showing the electrolytic refining of copper is shown .
What are the anode,cathode and electrolyte of this cell ?
Anode - Impure copper
Cathode - Pure copper
Electrolyte - Copper sulphate solution with H2SO4
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Figure of electrolysis of alumina is shown
(a) What are the anode and cathode ?
(b) Write the equation of cathode reaction.
(c) The anode blocks are to be replaced occasionally; Why?
(a)Anode - Carbon rods
Cathode - Carbon lining
(b) Al 3+ + 3e → Al
(c) The anode (carbon) is
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The figure of electrolytic production of aluminium is given
(a)Name the process of production of aluminium ?
(b) What are the anode and cathode of the cell ?
(c) What is the role of cryolite in the electrolysis?
(a) Hall-Heroult process
(b) Anode - Carbon rods
Cathode - Carbon lining
(c) To dissolve alumina /to reduce melting point of
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(a) Name the ore of aluminium ?
(b) Which is the method used to concentrate the ore of aluminium?
(c) Name the process used to produce aluminium ?
(a) Bauxite
(b) Leaching
(c)
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Names of some alloy steels are given in the box .
Alnico |
Stainless steel |
Nichrome |
(a) What is the common component in all these steels ?
(b) Which steel is used to make heating coils?
(c) Which is the steel is used to make permanent magnets ?
(d) What is the similarity between stainless steel and nichrome ?
(a) Iron
(b) Nichrome
(c) Alnico
(d) Both of them contain same
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Equation of reaction occuring in blast furnace during the production of iron are given.
CaCO3 → CaO + CO2
Fe2O3 + 3 CO → 2 Fe + 3 CO2
CaO +SiO2 → CaSiO3
(a) Which of these represent slag formation reaction ?
(b) Which is the substance acting as reducing agent in blast furnace?
(a) CaO +SiO2 →CaSiO3
(b)
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Iron produced in blast furnace
(a) Name the ore used here ?
(b) Why coke is added along with the ore to the blast furnace ?
(c) What is the role of limestone in blast furnace?
(a)Haematite .
(b)For the reduction of ore/For the formation of CO.
(c)To remove the
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Ag , Fe, Sn, Na, Au |
(a) Arrange the above metals in the decreasing order of their reactivity?
(b) Which metal is produced by reduction using electricity ?
(c) Which of the above occur free in nature ?
(d) Name the metal for which the compounds are highly stable ?
(a) Na > Fe>Sn>Ag>Au
(b) Na
(c) Au
(d)
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a)Complete the table.
Metal |
Method of refining |
Tin |
(x) |
Zinc |
(y) |
(a) identify x and y
(b) Which property of metals is made use of in the above process ?
(a) x - Liquation
y - distillation
(b) Melting point of tin is lower than impurities.
Boiling point of
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Equation related with the concentration of two ores of Zn are given.
i. ZnCO3 + Heat ? ZnO + CO2
ii. ZnS +O2 + Heat ? ZnO + SO2
a .Which of these equation represent roasting?
b . How does roasting differ from calcination ?
(a)second (ii)
(b)Calcination is carried out in the absence /limited supply of air .Where as roasting is carried out with the presence of excess
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Match suitably
Ore |
Nature of the ore |
The method of concentration |
Copper pyrites |
Density of the ore is heavier than gangue |
Leaching |
Magnetite |
Ore and gangue do not dissolve in same solvent |
Hydraulic washing |
Ore of gold |
Density of the ore is lighter than gangue |
Magnetic separation |
Bauxite |
Magnetic natured ore |
Froth floatation |
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Match the following
Metal |
Ore |
Copper |
Bauxite |
Zinc |
Haematite |
Iron |
Calamine |
Aluminium |
Cuprite |
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Clay,bauxite and precious stone are some minerals of aluminium.
a . Which among these is the ore of aluminium.
b . Write any two charecteristics of an ore
(a) Bauxite
(b) Abundance / Easily separable / High metal content
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Which is the reducing agent used in the extraction of reactive metals like sodium and potassium
Electricity
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Name the method used to concentrate bauxite.
(Leaching , Hydraulic washing , Magnetic separation )
Leaching
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Which method is used to remove tin stone from iron tungstate?
(Froth floatation ,Magnetic separation , Levigation, Leaching )
Magnetic separation
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Name the process used to concentrate the ore,Copper Pyrites
(CuFeS2) ?
Froth floatation
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(a) Hot NaOH solution
(b) Al(OH)3 precipitate
(c) Precipitate is seperated and heated
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a) Which is the reducing agent used to extract aluminium
b) complete the equation of the ionisation of alumina during electrolysis.
Al2 O3 ? ----- + -----
a) electricity
b) Al2O3 ? 2Al 3+ +
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a)Which of those given below is an alloy steel
(Bronze ,aluminium Bronze ,Nichrome ,Brass )
b) Write any one characteristic of the above alloy.
a) Nichrome
b) High resistance (electrical / corrosion
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What are the methods used to refine the following metals?Why those methods are employed?
a) Tin b)Cadmium
Tin - Liquation - Low melting point
Cadmium---Distillation- Low boiling
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The production of Aluminium is different from that of Iron.
a)Which is the method of concentration of the ore of aluminium
b)Which is the reducing agent used in the production of Aluminium?
c)Name the furnace used in the production of iron.
d) pig iron directly got from the furnace is not used as such.What may be the reason?
a)Leaching.
b)Electricity
c)Blast furnace.
d)Presence of high amount of impurities such as carbon,sulphur,and phosphorus make it
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Answer the questions related to concentrations of bauxite given below.
a) Which method is used to concentrate bauxite?
b) Name the product obtained on heating aluminium hydroxide
a) Leaching.
b) Alumina/Aluminium
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The components of stainless steel and nichrome are Fe, Ni,Cr,C.
a) Write any one characteristic of each of these.
b)Why these two are showing different characteristic?
a) Stainless steel: Very hard/Corrosion resistant etc
Nichrome: High resistance/High melting poin/corrosion resistant etc
b)Though the constituent
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Flux is used to remove impurities which is is not removed during the concentration of ore
a) How does flux remove gangue?
b) The gangue present in an ore is FeO.Select a flux that can be used to remove tis gangue.
(CaO,MgO,SiO2)
(Hint: Metallic oxides are basic and non metallic oxides are acidic)
a) Flux reacts with gangue to form low melting slag.
b) SiO2 /
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a)What are minerals?
b)All minerals are not ores.Why?(give two reasons)
a)Naturally compounds of metals.
b)
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A is a carbonate ore of a metal and B is a sulphide ore of a metal.
a) Which method is used to concentrate the ore B
b)Which method is used to convert the concentrated ore A into the oxide
b)Select from those in the bracket the process in which the ore is converted to metal and write it.
( Oxidation, Electro plating, Reduction)
a) Froath floation
b) Calcination
c)
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Some ores are given.
a) Bauxite Al2O3.2H2O
b) Zinc Blende ZnS
c) Tin Stone SnO2
d)Haematite Fe2O3
Which of the above ore is roasted?
Which is the method used to concentrate tinstone?
Zinc Blende
Magnetic
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a) Which one of these is an alloyf steel.?
(Bronze, Aluminium Bronze, Nichrome, Brass)
b)Write any one characteristic of the above alloy.
a)Nichrome
b)High resistance(Electrical/corrosion
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a) Which is the reducing agent used to extract aluminium from alumina?
b)Complete the equation of ionisation of alumina during electrolysis
Al2O3→........ +.........
a)Electricity
b)Al2O3→2Al3+
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Ore |
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