Chemistry One Mark Question Bank and Lesson Wise Test Papers
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Questions and Answers

What is the composition of Bauxite?

  • Al2O3.nH2O (correct)
  • Fe2O3.2H2O
  • None of these
  • Al2O3

    • Roasting of sulphide ore gives which gas?

  • H2S
  • SO3
  • SO2 (correct)
  • CO2

    • Which reaction represents calcinations?

  • 2Zn + O2 → 2ZnO
  • Both (a) and (c)
  • MgCO3 → MgO + CO2 (correct)
  • 2ZnS + 3O2 → 2ZnO + 2SO2

    • Which metal oxide cannot be reduced to metal by carbon?

    <p>ZnO</p> Signup and view all the answers

    Which metal is extracted by the Hall-Heroult process?

    <p>Al</p> Signup and view all the answers

    Which statement about the advantage of roasting of sulphide ore before reduction is not true?

    <p>It makes the ore magnetic.</p> Signup and view all the answers

    Which of the following statements is true about the extraction of gold and silver?

    <p>Leaching with cyanide ion is used for extraction</p> Signup and view all the answers

    Which substance is added in the extraction of aluminium from alumina by electrolysis?

    <p>Cryolite to lower the melting point of alumina</p> Signup and view all the answers

    What is the purpose of flux in metallurgy?

    <p>All of these</p> Signup and view all the answers

    Which of the following ores is best concentrated by froth–floatation method?

    <p>Galena</p> Signup and view all the answers

    What can be concluded from the Ellingham diagram regarding the reduction of alumina?

    <p>Mg can be used to reduce alumina</p> Signup and view all the answers

    Which process is used for concentrating ore in metallurgy?

    <p>Froth floatation</p> Signup and view all the answers

    What is the method known as 523K Zr (impure) +2I2 → ZrI4?

    <p>Van Arkel process</p> Signup and view all the answers

    Which one of the following is not feasible?

    <p>$Cu(s) + Zn^{2+}(aq) → Zn(s) + Cu^{2+}(aq)$</p> Signup and view all the answers

    What does $ riangle G^{ heta}_f$ indicate about sulphide, CS2, and H2S?

    <p>$ riangle G^{ heta}_f$ of sulphide is greater than those for CS2 and H2S.</p> Signup and view all the answers

    Which of the following statements about roasting of sulphide to its oxide is not true?

    <p>Roasting of the sulphide to its oxide is thermodynamically feasible</p> Signup and view all the answers

    Wolframite ore is separated from tinstone by the process of:

    <p>Electromagnetic separation</p> Signup and view all the answers

    Which one of the following reactions is not feasible?

    <p>Cu(s) + Zn2+(aq) → Zn(s) + Cu2+(aq)</p> Signup and view all the answers

    Which process is used to extract silver?

    <p>Electrochemical process</p> Signup and view all the answers

    What is the purpose of flux in metallurgy?

    <p>Conversion of infusible impurities to soluble impurities</p> Signup and view all the answers

    Which one of the following ores is best concentrated by froth–floatation method?

    <p>Galena</p> Signup and view all the answers

    In the extraction of aluminium from alumina by electrolysis, cryolite is added to:

    <p>Lower the melting point of alumina</p> Signup and view all the answers

    How is zinc obtained from ZnO?

    <p>Carbon reduction</p> Signup and view all the answers

    In the extraction of gold and silver, how is silver later recovered after leaching with cyanide ion?

    <p>Displacement with zinc</p> Signup and view all the answers

    According to Ellingham diagram, which metal can be used to reduce alumina?

    <p>Zn</p> Signup and view all the answers

    Study Notes

    Composition of Minerals and Ores

    • Bauxite is composed of aluminium hydroxide (Al2O3.2H2O)

    Roasting of Sulphide Ore

    • Roasting of sulphide ore gives sulphur dioxide (SO2) gas

    Calcination

    • Calcination reaction is represented as CaCO3 → CaO + CO2

    Reduction of Metal Oxides

    • Chromium oxide (Cr2O3) cannot be reduced to metal by carbon

    Extraction of Metals

    • Aluminium is extracted by the Hall-Heroult process
    • Gold and silver are extracted by leaching with cyanide ion, and silver is later recovered by reacting with zinc

    Roasting of Sulphide Ore

    • Roasting of sulphide ore does not make the ore porous

    Extraction of Aluminium

    • Cryolite is added to alumina in the extraction of aluminium by electrolysis to lower the melting point

    Metallurgy

    • Flux is added in metallurgy to remove impurities
    • Froth-floatation method is used to concentrate ores like sulphide ores
    • Magnetic separation is used to concentrate wolframite ore from tinstone

    Reduction of Alumina

    • According to the Ellingham diagram, aluminium can be used to reduce alumina
    • Zinc can be obtained from ZnO by reducing it with carbon at high temperatures

    Miscellaneous

    • The Van Arkel process is used to purify Zr, represented as 523K Zr (impure) + 2I2 → ZrI4
    • The reaction 2Al + Fe2O3 → 2Fe + Al2O3 is not feasible
    • ΔG^θ_f indicates the feasibility of a reaction, and a negative value indicates a spontaneous reaction, making it feasible to obtain sulphide, CS2, and H2S

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    Description

    This quiz is a collection of one mark question bank and lesson wise slip test question papers for Chemistry. It covers book back questions and additional questions from Volume 1 & 2 of the specified publication.

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