12th Standard Chemistry Study material & Free Online Practice Tests - View and download Sample Question Papers with Solutions for Class 12 Session 2019 - 2020 TN Stateboard

Chemistry Question Papers

12th Chemistry - p - Block Elements - II Two Marks Questions - by Saroja - Vellore - View & Download

  • 1)

    What is inert pair effect?

  • 2)

    Give the oxidation state of halogen in the following.
    a) OF2
    b) O2F2
    c) Cl2O3
    d) I2O4

  • 3)

    What are interhalogen compounds? Give examples.

  • 4)

    What is the hybridisation of iodine in IF7? Give its structure?

  • 5)

    How is nitrogen prepared from liquid air?

12th Standard Chemistry Unit 2 p - Block Elements - I Two Marks Questions - by Saroja - Vellore - View & Download

  • 1)

    Write a short note on anamolous properties of the first element of p-block

  • 2)

    Describe briefly allotropism in p- block elements with specific reference to carbon

  • 3)

    Give the uses of Borax

  • 4)

    Write a note on Fisher tropsch synthesis

  • 5)

    Give the structure of CO and CO2.

12th Chemistry Unit 1 Metallurgy Two Marks Questions - by Saroja - Vellore - View & Download

  • 1)

    What is the difference between minerals and ores?

  • 2)

    What are the various steps involved in extraction of pure metals from their ores?

  • 3)

    Which type of ores can be concentrated by froth floatation method? Give two examples for such ores.

  • 4)

    Describe a method for refining nickel

  • 5)

    What is metallurgy?

12th Chemistry - Term 1 Five Mark Model Question Paper - by Saroja - Vellore - View & Download

  • 1)

    Explain the principle of electrolytic refining with an example.

  • 2)

    Give the limitations of Ellingham diagram

  • 3)

    Write a note on zeolites.

  • 4)

    What happens when PCl5 is heated?

  • 5)

    What type of hybridisation occur in
    a) BrF5
    b) BrF3

12th Chemistry Quarterly Model Question Paper - by Saroja - Vellore - View & Download

  • 1)

    Bauxite has the composition

  • 2)

    Cupellation is a process used for the refining of

  • 3)

    Boric acid is an acid because its molecule (NEET)

  • 4)

    The molarity of given orthophosphoric acid solution is 2M. its normality is

  • 5)

    The alloy of copper that contain Zinc is

12th Standard Chemistry Unit 7 Chemical Kinetics Book Back Questions - by Saroja - Vellore - View & Download

  • 1)

    For a first order reaction A ⟶ B the rate constant is x min−1. If the initial concentration of A is 0.01M , the concentration of A after one hour is given by the expression.

  • 2)

    The addition of a catalyst during a chemical reaction alters which of the following quantities? (NEET)

  • 3)

    In a reversible reaction, the enthalpy change and the activation energy in the forward direction are respectively −x kJ mol-4 and kJ mol-1 Therefore , the energy of activation in the backward direction is

  • 4)

    Assertion: rate of reaction doubles when the concentration of the reactant is doubles if it is a first order reaction.
    Reason: rate constant also doubles

  • 5)

    If the initial concentration of the reactant is doubled, the time for half reaction is also doubled. Then the order of the reaction is

12th Standard Chemistry Unit 6 Solid State Book Back Questions - by Saroja - Vellore - View & Download

  • 1)

    Graphite and diamond are

  • 2)

    In calcium fluoride, having the flurite structure the coordination number of Ca2+ ion and F- Ion are (NEET)

  • 3)

    The number of carbon atoms per unit cell of diamond is

  • 4)

    The composition of a sample of wurtzite is FeO0.931.00 what % of Iron present in the form of Fe3+?

  • 5)

    A solid compound XY has NaCl structure. if the radius of the cation is 100pm , the radius of the anion will be

12th Standard Chemistry Chapter 5 Coordination Chemistry Book Back Questions - by Saroja - Vellore - View & Download

  • 1)

    The sum of primary valance and secondary valance of the metal M in the complex [M(en)2(Ox)]Cl isL

  • 2)

    IUPAC name of the complex K3[Al(C2O4)3] is 

  • 3)

    Crystal field stabilization energy for high spin d5 octahedral complex is

  • 4)

    Which type of isomerism is exhibited by [Pt(NH3)2Cl2]?

  • 5)

    How many geometrical isomers are possible for<<EVA035.eps>>?

12th Standard Chemistry - p Block Elements - II Book Back Questions - by Saroja - Vellore - View & Download

  • 1)

    In which of the following , NH3 is not used?

  • 2)

    P4O6 reacts with cold water to give

  • 3)

    The molarity of given orthophosphoric acid solution is 2M. its normality is

  • 4)

    The correct order of the thermal stability of hydrogen halide is

  • 5)

    Most easily liquefiable gas is

12th Standard Chemistry - Transition and Inner Transition Elements Book Back Questions - by Saroja - Vellore - View & Download

  • 1)

    Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell?

  • 2)

    the catalytic behaviour of transition metals and their compounds is ascribed mainly due to

  • 3)

    The correct order of increasing oxidizing power in the series

  • 4)

    Which of the following statements is not true?

  • 5)

    Permanganate ion changes to ________ in acidic medium

12th Standard Chemistry Unit 2 p - Block Elements - I Book Back Questions - by Saroja - Vellore - View & Download

  • 1)

    The element that does not show catenation among the following p-block elements is

  • 2)

    Oxidation state of carbon in its hydrides

  • 3)

    Which of the following is not sp2 hybridised?

  • 4)

    AlF3 is soluble in HF only in the presence of KF. It is due to the formation of (NEET)

  • 5)

    The stability of +1 oxidation state increases in the sequence

12th Standard Chemistry Metallurgy Book Back Questions - by Saroja - Vellore - View & Download

  • 1)

    In the electrolytic refining of copper, which one of the following is used as anode?

  • 2)

    Which of the following plot gives Ellingham diagram

  • 3)

    In the Ellingham diagram, for the formation of carbon monoxide

  • 4)

    Which of the following reduction is not thermodynamically feasible?

  • 5)

    Which of the following is not true with respect to Ellingham diagram?

12th Standard Chemistry Chapter 1 Metallurgy One Mark Question and Answer - by Saroja - Vellore - View & Download

  • 1)

    Bauxite has the composition

  • 2)

    Which of the metal is extracted by Hall-Heroult process?

  • 3)

    Which of the following is commonly used to produce foam in froth floatation process?

  • 4)

    Among the following, one does not belong to calcination, Pick the odd one out.

  • 5)

    Which of the following is incorrect with respect to metallurgy of iron in the blast furnace?

12th Standard Chemistry Unit 7 Chemical Kinetics One Mark Question and Answer - by Saroja - Vellore - View & Download

  • 1)

    For a first order reaction A ⟶ B the rate constant is x min−1. If the initial concentration of A is 0.01M , the concentration of A after one hour is given by the expression.

  • 2)

    A zero order reaction X ⟶ XProduct, with an initial concentration 0.02M has a half life of 10 min. if one starts with concentration 0.04M, then the half life is

  • 3)

    The addition of a catalyst during a chemical reaction alters which of the following quantities? (NEET)

  • 4)

    For a reaction, 2A + B ⟶ 3C, The rate of appearance of C at time 't' is 1.2 x 10-4 mol L-1s-1. Identify the rate of reaction.

  • 5)

    For the reaction, 2N2O5 ⟶4 NO2+O2, select the correct statement.

12th Standard Chemistry - Solid State One Mark Question with Answer - by Saroja - Vellore - View & Download

  • 1)

    Graphite and diamond are

  • 2)

    An ionic compound AxBy crystallizes in fcc type crystal structure with B ions at the centre of each face and A ion occupying entre of the cube. the correct formula of AxBy is

  • 3)

    The number of unit cells in 8 gm of an element X ( atomic mass 40) which crystallizes in bcc pattern is (NA is the Avogadro number)

  • 4)

    Which of the following is characteristic of ionic solids?

  • 5)

    An example of metal deficiency defect

12th Chemistry - Coordination Chemistry - One Mark Question and Answer - by Saroja - Vellore - View & Download

  • 1)

    A magnetic moment of 1.73BM will be shown by one among the following (NEET)

  • 2)

    Crystal field stabilization energy for high spin d5 octahedral complex is

  • 3)

    In which of the following coordination entities the magnitude of Δ0 will be maximum?

  • 4)

    The total number of electrons donated by ligands to platinum ion in [Pt(en)2CI2] is

  • 5)

    Primary and secondary valencies of Cu in [Cu(NH3)4]SO4 is

12th Chemistry Chapter 6 Solid State One Mark Question with Answer Key - by Saroja - Vellore - View & Download

  • 1)

    Graphite and diamond are

  • 2)

    In calcium fluoride, having the flurite structure the coordination number of Ca2+ ion and F- Ion are (NEET)

  • 3)

    The number of carbon atoms per unit cell of diamond is

  • 4)

    The ionic radii of A+ and B are 098X10-10 mand 1.81X10-10. m. the coordination number of each ion in AB is

  • 5)

    Which of the following cannot be regarded as molecular solid?

12th Chemistry Unit 4 Transition and Inner Transition Elements One Mark Question with Answer Key - by Saroja - Vellore - View & Download

  • 1)

    Sc( Z=21) is a transition element but Zinc (z=30) is not becaus

  • 2)

    The correct order of increasing oxidizing power in the series

  • 3)

    The alloy of copper that contain Zinc is

  • 4)

    In acid medium, potassium permanganate oxidizes oxalic acid to

  • 5)

    Which of the following statements is not true?

12th Chemistry Unit 3 p - Block Elements - II One Mark Question Paper with Answer Key - by Saroja - Vellore - View & Download

  • 1)

    In which of the following , NH3 is not used?

  • 2)

    Which is true regarding nitrogen?

  • 3)

    In the brown ring test, brown colour of the ring is due to

  • 4)

    On hydrolysis, PCl3 gives

  • 5)

    P4O6 reacts with cold water to give

12th Chemistry Unit 2 p - Block Elements - I One Mark Question Paper - by Saroja - Vellore - View & Download

  • 1)

    An aqueous solution of borax is

  • 2)

    Boric acid is an acid because its molecule (NEET)

  • 3)

    In diborane, the number of electrons that accounts for banana bonds is

  • 4)

    The element that does not show catenation among the following p-block elements is

  • 5)

    Carbon atoms in fullerene with formula C60 have

12th Chemistry Chapter 1 Metallurgy One Mark Question Paper - by Saroja - Vellore - View & Download

  • 1)

    Bauxite has the composition

  • 2)

    Which of the metal is extracted by Hall-Heroult process?

  • 3)

    Electrochemical process is used to extract

  • 4)

    Zinc is obtained from ZnO by

  • 5)

    Which of the following is used for concentrating ore in metallurgy?

12th Chemistry Solid State Model Question Paper - by Saroja - Vellore - View & Download

  • 1)

    Graphite and diamond are

  • 2)

    In calcium fluoride, having the flurite structure the coordination number of Ca2+ ion and F- Ion are (NEET)

  • 3)

    The ionic radii of A+ and B are 098X10-10 mand 1.81X10-10. m. the coordination number of each ion in AB is

  • 4)

     if ‘a’ stands for the edge length of the cubic system ; sc , bcc, and fcc. Then the ratio of radii of spheres in these systems will be respectively

  • 5)

    Which one of the following crystal has 8: 8 structure?

12th Chemistry Unit 5 Coordination Chemistry Model Question Paper - by Saroja - Vellore - View & Download

  • 1)

    The sum of primary valance and secondary valance of the metal M in the complex [M(en)2(Ox)]Cl isL

  • 2)

    A magnetic moment of 1.73BM will be shown by one among the following (NEET)

  • 3)

    How many geometrical isomers are possible for<<EVA035.eps>>?

  • 4)

    Fac-mer isomerism is shown by

  • 5)

    Choose the correct statement

12th Standard Chemistry Chemical Kinetics Model Question Paper - by Saroja - Vellore - View & Download

  • 1)

    For a first order reaction A ⟶ B the rate constant is x min−1. If the initial concentration of A is 0.01M , the concentration of A after one hour is given by the expression.

  • 2)

    A zero order reaction X ⟶ XProduct, with an initial concentration 0.02M has a half life of 10 min. if one starts with concentration 0.04M, then the half life is

  • 3)

    The addition of a catalyst during a chemical reaction alters which of the following quantities? (NEET)

  • 4)

    What is the activation energy for a reaction if its rate doubles when the temperature is raised from 200K to 400K? (R = 8.314 JK-1mol-1)

  • 5)

    In a first order reaction \(x\longrightarrow y\) if k is the rate constant and the initial concentration of the reactant x is 0.1M, then, the half life is 

12th Standard Chemistry Chapter 6 Solid State Model Question Paper - by Saroja - Vellore - View & Download

  • 1)

    Graphite and diamond are

  • 2)

    The number of carbon atoms per unit cell of diamond is

  • 3)

    The vacant space in bcc lattice unit cell is

  • 4)

    Which of the following cannot be regarded as molecular solid?

  • 5)

    Which of the following is characteristic of ionic solids?

12th Standard Chemistry First Mid Term Model Question Paper - by Saroja - Vellore - View & Download

  • 1)

    Bauxite has the composition

  • 2)

    Wolframite ore is separated from tinstone by the process of

  • 3)

    Considering Ellingham diagram, which of the following metals can be used to reduce alumina? (NEET-2018)

  • 4)

    AlF3 is soluble in HF only in the presence of KF. It is due to the formation of (NEET)

  • 5)

    The cation leaves its normal position in the crystal and moves to some interstitial position, the defect in the crystal is known as

12th Standard Chemistry Chapter 4 Transition and Inner Transition Elements Important Question Paper - by Saroja - Vellore - View & Download

  • 1)

    Which one of the following ions has the same number of unpaired electrons as present in V3+?

  • 2)

    The magnetic moment of Mn2+ ion is

  • 3)

    Which of the following compounds is colourless?

  • 4)

    Which of the following is wrong with respect to lanthanide contraction?

  • 5)

    Hybridisation of chromium ions and dichromate ions is

12th Standard Chemistry Chapter 3 p - Block Elements - II Important Question Paper - by Saroja - Vellore - View & Download

  • 1)

    In which of the following , NH3 is not used?

  • 2)

    Which is true regarding nitrogen?

  • 3)

    An element belongs to group 15 and 3 rd period of the periodic table, its electronic configuration would be

  • 4)

    S-S bond is present in

  • 5)

    Pick the wrong one among the following

12th Standard Chemistry Unit 2 p - Block Elements - I Important Question Paper - by Saroja - Vellore - View & Download

  • 1)

    An aqueous solution of borax is

  • 2)

    Boric acid is an acid because its molecule (NEET)

  • 3)

    Which among the following is not a borane?

  • 4)

    Lewis acid character of boron trihalides is as a follows:

  • 5)

    Select the incorrect statement regarding B2H6.

12th Chemistry - Unit 1 Important Question Paper - by Saroja - Vellore - View & Download

  • 1)

    Bauxite has the composition

  • 2)

    Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is

  • 3)

    Which one of the following reaction represents calcinations?

  • 4)

    Which of the following is not a mineral of aluminium?

  • 5)

    Which of the following is commonly used to produce foam in froth floatation process?

model test question paper for new syllabus state board english medium in chemistry chapter one metallurgy - by Mohan Raj - View & Download

  • 1)

    Bauxite has the composition

  • 2)

    Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is

  • 3)

    Which one of the following reaction represents calcinations?

  • 4)

    The metal oxide which cannot be reduced to metal by carbon is

  • 5)

    Which of the metal is extracted by Hall-Heroult process?

chemistrty most asked creative five mark questions in chapter one english medium - by Mohan Raj - View & Download

  • 1)

    List out the application of aluminum

  • 2)

    List the applications of iron

  • 3)

    How can you separate alumina from silica in a bauxite ore

  • 4)

    What is zone refining? Describe the principle involved in the purification of the metal by this method.

  • 5)

    Write short note on the following:
    (i) The process in which no external reducing agent is used.
    (ii) The process which is used for highly electro positive metal.
    (iii) Write the equation involved in the thermite process.

chapter one creative five mark questions chemistry english medium - by Mohan Raj - View & Download

  • 1)

    Explain froth flotation, with diagram.

  • 2)

    Explain concentration by magnetic separation with diagram.

  • 3)

    In the extraction of copper, explain the smelting process.

  • 4)

    Explain refining of nickel by mond's process

  • 5)

    Explain refming of titanium by Van-Arkel method.

english medium stateboard most important five mark questuions in chemistry chapter one metallurgy - by Mohan Raj - View & Download

  • 1)

    Describe the role of the following in the process mentioned.
    (i) Silica in the extraction of copper.
    (ii) Cryolite in the extraction of aluminium.
    (iii) Iodine in the refining of Zirconium.
    (iv) Sodium cyanide in froth floatation.

  • 2)

    Explain the principle of electrolytic refining with an example.

  • 3)

    The selection of reducing agent depends on the thermodynamic factor: Explain with an example.

  • 4)

    Give the limitations of Ellingham diagram

  • 5)

    Write a short note on electrochemical principles of metallurgy.

important three mark questions in chemistry metallurgy for state board english medium - by Mohan Raj - View & Download

  • 1)

    Write the molecular composition of the following ores and mentions it metal : magnetite) calamine and bauxite.

  • 2)

    (i) Which of the following metals cannot: be extracted by the smelting process : 1 AI, Zn, Fe and Pb. Give reasons.
    (ii) Which one is a good reducing agent (C or CO) for Fe2O3, below 1073 k?

  • 3)

    What is coupling of reaction? How is it useful in metallurgy?

  • 4)

    Explain how the metal oxide is converted into metal using carbon as a reducing agent.

  • 5)

    How oxides of metals are reduced by hydrogen?

chemistry chapter one creative three mark questions for +2 english medium - by Mohan Raj - View & Download

  • 1)

    Explain alkali leaching in the extraction of aluminum,

  • 2)

    How is acid leaching done for the sulphide ores?

  • 3)

    Before reduction, the ore is first convertedI into the oxide of metal of interest. Gtve reason

  • 4)

    Explain roasting with an example.

  • 5)

    Explain calcination with an example.

Frequently asked three mark questions chemistry 12th standard unit one metallurgy in chemistry - by Mohan Raj - View & Download

  • 1)

    Explain zone refining process with an example using the Ellingham diagram given below

  • 2)

    (A) Predict the conditions under which
    (i) Aluminium might be expected to reduce magnesia.
    (ii) Magnesium could reduce alumina.
    (B) Carbon monoxide is more effective reducing agent than carbon below 983K but, above this temperature, the reverse is true –Explain.
    (c) it is possible to reduce Fe2O3 by coke at a temperature around 1200K

  • 3)

    Give the uses of zinc.

  • 4)

    Explain the electrometallurgy of aluminium

  • 5)

    Explain the following terms with suitable examples.
    (i) Gangue
    (ii) slag

state board english medium chemistry metallurgy Important finding wrong statement questions in chemistry - by Mohan Raj - View & Download

  • 1)

    About "Electrolytic refining"
    a) The crude metal is refined by electrolysis.
    b) The rods of impure metal are used as cathode.
    c) Thin strips of pure metal are used as cathode.
    d) Less electropositive impurities removed as anode mud.

  • 2)

    About "Van-Arkel''
    a)Van-Arkel method used for refining Zirconium.
    b) Aluminium is a bad conductor of heat.
    c) Aluminium shows high resistance to corrosion.
    d) Aluminium is a good conductor of heat

  • 3)

    a) Aluminium is used to produce die-castings
    b) Gold nanopartides used as an catalysts
    c) Copper is the first metal used by the human
    d) Brass is an alloy of zinc and copper

  • 4)

    a) Germanium is used as an semi conductor
    b) Stainless steel is an important alloy of Aluminum
    c) Zinc sulphide is used in making luminous paints.
    d) Brass an alloy of zinc is used in water valves

  • 5)

    a) Metallic oxides can be reduced by an alumino thermitc process.
    b) Flux + gangue\(\rightarrow\) slag
    c) Silica gangue present in the ore is basic in nature
    d) Cu2S + FeS \(\rightarrow\)Copper matter

creative two marks questions in +2 chemistry english medium state board chapter one - by Mohan Raj - View & Download

  • 1)

    What is metallurgy?

  • 2)

    Why should we have a ecofriendly metallurgical process?

  • 3)

    Name some elements that occur as native elements.

  • 4)

    What is meant by concentration?

  • 5)

    Can the same method of extraction be used for all metals

Creative assertion and reason questions chemistry chapter one english medium twelfth standard - by Mohan Raj - View & Download

  • 1)

    Assertion :Aluminium is used in the, design of chemical reactors, : medical equipments, , refrigeration units and gas' pipelines.
    Reason : Aluminium shows high resistance to corrosion
    (a) Both (A) and (R) are true and (R) is the correct explanation of (A)
    (b) Both (A) and (R) are true and (R) is not the correct explanation of (A).
    (c) (A) true but (R) false
    (d) Both (A) and (R) are false.

  • 2)

    Assertion(A) :Metallic zinc is used in galvanising metals such as iron and steel.
    Reason (R) :Zinc is also used to produce die castings
    a) Both (A) and (R) are true and (R) is the correct explanation of (A).
    b) Both (A) and (R) are true and (R) is not the correct explanation of (A).
    c) (A) true but (R) false.
    d) Both (A) and (R) are false.

  • 3)

    Assertion(A) : Zone refining is carried out in an inert gas atmosphere
    Reason (R):The metal is treated with a suitable reagent which can form a volatile compound with the metal.
    a) Both (A) and (R) are true and (R) is the correct explanation of (A).
    b) Both (A) and (R) are true and (R) is not the correct explanation of (A).
    c) (A) true but (R) false.
    d) Both (A) and (R) are false

  • 4)

    Assertion :Cuprite is concentrated by froth floatation process.
    Reason :Cuprite is the sulphide ore
    a) Both assertion and reason are true and the reason is the correct explanation of the assertion.
    b) Both assertion and reason are true but the reason is not the correct explanation of the assertion.
    |c) Assertion is true, but reason is false.
    d) Both assertion and reason are false

  • 5)

    Assertion :Calamine and Dolomite are the Carbonate ores.
    Reason :Calamine is ZnCO3 whereas dolomite is MgCO3.ZnCO3
    a) Both assertion and reason are true and the reason is the correct explanation of the assertion.
    b) Both assertion and reason are true but the reason is not the correct explanation of the assertion.
    c) Assertion is true, but reason is false.
    d) Both assertion and reason are false

English medium twelfth standard most important one mark questions chemistry chapter one metallurgy - by Mohan Raj - View & Download

  • 1)

    \(\Delta { G }^{ o }\) vs T plot in the Ellingham's diagram slopes downward the reaction.

  • 2)

    Pick out the alloy that contains a non-metal as a constituent in it

  • 3)

    Ignition mixture used in aluminothermite process is

  • 4)

    Malachite has______ composition.

  • 5)

    Zinc blende is_________

twelfth standard chemistry Chapter one multiple choice creative questions - by Mohan Raj - View & Download

  • 1)

    Which metal is used for extraction of Au and Ag and also for galvanisation of iron objects?

  • 2)

    Which of the following is not a mineral of aluminium?

  • 3)

    Which of the following is commonly used to produce foam in froth floatation process?

  • 4)

    Among the following, one does not belong to calcination, Pick the odd one out.

  • 5)

    Which of the following is incorrect with respect to metallurgy of iron in the blast furnace?

mostly asked multiple choice questions in twelfth standard chemistry metallurgy - by Mohan Raj - View & Download

  • 1)

    Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?

  • 2)

    Match items in column - I with the items of column – II and assign the correct code.
     

           Column-I      Column-II
    A. Cyanide process (i) Ultrapure Ge
    B Froth floatation process (ii) Dressing of ZnS
    C Electrolytic reduction (iii) Extraction of Al
    D Zone refining (iv) Extraction of Au
        (v) Purification of Ni
  • 3)

    Wolframite ore is separated from tinstone by the process of

  • 4)

    Which one of the following is not feasible

  • 5)

    Electrochemical process is used to extract

Chemistry twelfth standard english medium chapter one important one mark questions - by Mohan Raj - View & Download

  • 1)

    Bauxite has the composition

  • 2)

    Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is

  • 3)

    Which one of the following reaction represents calcinations?

  • 4)

    The metal oxide which cannot be reduced to metal by carbon is

  • 5)

    Which of the metal is extracted by Hall-Heroult process?

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