Solutions & Metallurgy - Combined Test

30 Questions | Total Attempts: 54

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Solutions & Metallurgy - Combined Test

TIME ALLOTTED - 60 minutes For every correct answer, +4 marks will be given. For every unattempted question, 0 marks will be given. For every incorrect answer, -1 marks will be given. Choose yours answers wisely and efficiently due to NEGATIVE MARKING. ALL THE BEST.


Questions and Answers
  • 1. 
    How much water should be added to 500 mL, 0.5 M NaOH so that its new strength becomes 10 mg NaOH per mL?
    • A. 

      100 mL

    • B. 

      200 mL

    • C. 

      250 mL

    • D. 

      500 mL

  • 2. 
    Two bottles of A and B contains 1 M and 1 m aqueous solution (d=1 g/mL) of sulphuric acid respectively. Choose the correct option
    • A. 

      A is more concentrated than B

    • B. 

      B is more concentrated than A

    • C. 

      A and B have same concentration

    • D. 

      It is not possible to compare the concentrations of A and B

  • 3. 
    One mole of non-volatile solute is dissolved in two moles of water. The vapour pressure of the solution relative to pure water is-
    • A. 

      2/3

    • B. 

      1/3

    • C. 

      1/2

    • D. 

      3/2

  • 4. 
    The vapour pressure of water at room temperature is 23.8 mm of Hg. What will be the vapour pressure of an aqueous solution of sucrose (Mole fraction of sucrose = 0.1) ? 
    • A. 

      23.9 mm Hg

    • B. 

      24.2 mm Hg

    • C. 

      21.42 mm Hg

    • D. 

      31.44 mm Hg

  • 5. 
    Which of the following is not a colligative property?
    • A. 

      Osmotic pressure

    • B. 

      Relative Lowering of Vapour Pressure

    • C. 

      Depression in Freezing point

    • D. 

      Refractive Index

  • 6. 
    An aqueous solution freezes at -0.1860C. (Kf = 1.86, Kb = 0.512 ). What is the elevation in boiling point?
    • A. 

      0.186

    • B. 

      0.512

    • C. 

      0.512 / 0.186

    • D. 

      0.0512

  • 7. 
    The freezing point of 1 molal NaCl solution assuming NaCl to be 100% dissociated in water is : (Kf = 1.86 K/m)
    • A. 

      -1.860C

    • B. 

      -3.720C

    • C. 

      +1.860C

    • D. 

      +3.720C

  • 8. 
    An azeotropic mixture of two liquids has boiling point lower than either of them when it-
    • A. 

      Shows a positive deviation from Raoult's Law

    • B. 

      Shows no deviation from Raoult's Law

    • C. 

      Shows a negative deviation from Raoult's Law

    • D. 

      Shows a negative deviation from Henry's Law

  • 9. 
    Which of the following 0.1 M aqueous solutions will have the lowest freezing point?
    • A. 

      Potassium sulphate

    • B. 

      Sodium Chloride

    • C. 

      Urea

    • D. 

      Glucose

  • 10. 
    The mole fraction of the solute in 2 molal aqueous solution is-
    • A. 

      0.347

    • B. 

      0.0347

    • C. 

      0.018

    • D. 

      0.009

  • 11. 
    A solution of urea (molar mass 56 g/mol) boils at 100.180C at the atmospheric pressure. If Kf and Kb for water are 1.86 and 0.512 K kg/mol respectively, the above solution will freeze at-
    • A. 

      -6.540C

    • B. 

      -0.6540C

    • C. 

      6.540C

    • D. 

      0.6540C

  • 12. 
    The freezing point depression constant for water is -1.860C/m. If 5.00 g Na2SO4 is dissolved in 45 g H2O, the freezing point is changed by -3.820C. Calculate the Van't Hoff factor for Na2SO4.
    • A. 

      2.05

    • B. 

      2.63

    • C. 

      3.11

    • D. 

      0.381

  • 13. 
    A gaseous mixture was prepared by taking equal mole of CO and N2. If total pressure of the mixture is 1 atm, the partial pressure of N2 in the mixture is-
    • A. 

      0.5 atm

    • B. 

      0.8 atm

    • C. 

      1 atm

    • D. 

      0.4 atm

  • 14. 
    An aqueous solution is 1.00 molal in KI. Which change will cause the vapour pressure of the solution to increase?
    • A. 

      Addition of water

    • B. 

      Addition of NaCl

    • C. 

      Addition of Na2SO4

    • D. 

      Addition of 100 molal KI

  • 15. 
    Zinc blende on roasting gives-
    • A. 

      Zinc carbonate

    • B. 

      SO2 and ZnO

    • C. 

      ZnS and ZnSO4

    • D. 

      CO2 and ZnO

  • 16. 
    The most abundant element found in earth's crust is-
    • A. 

      Tin

    • B. 

      Hydrogen

    • C. 

      Silicon

    • D. 

      Oxygen

  • 17. 
    When Alumina is electrolysed in presence of cryolite, the gas liberated at graphite anode is-
    • A. 

      F2

    • B. 

      O2

    • C. 

      CF4

    • D. 

      Cl2

  • 18. 
    In the manufacture of iron from haematite, lime stone is added to act as-
    • A. 

      Flux

    • B. 

      Slag

    • C. 

      Reducing agent

    • D. 

      Oxidizing agent

  • 19. 
    The slag obtained during the extraction of copper from copper pyrites is composed of-
    • A. 

      Cu2S

    • B. 

      CuSiO3

    • C. 

      FeSiO3

    • D. 

      SiO2

  • 20. 
    Which of the following is obtained by hydrometallurgy?
    • A. 

      Cu

    • B. 

      Au

    • C. 

      Ag 

    • D. 

      All of the above

  • 21. 
    Why cryolite is used in extraction of aluminium from bauxite?
    • A. 

      To minimise the heat loss due to radiation

    • B. 

      To protect alumina from freezing

    • C. 

      It allows alumina to melt at lower temperature

    • D. 

      To decrease solubility of impurities 

  • 22. 
    In froth floatation process for the purification of ores, the particles of ore float because-
    • A. 

      Their surface is not easily wetted by water

    • B. 

      They are light

    • C. 

      They are insoluble

    • D. 

      They bear electrostatic charge

  • 23. 
    In Hall Herout process, the main reagent is mixed with-
    • A. 

      NaF

    • B. 

      Na3AlF6

    • C. 

      AlF3

    • D. 

      None of these

  • 24. 
    The following reactions take place in the blast furnace preparation of impure iron. Identify the reaction pertaining to the formation of slag-
    • A. 

      2C(s) + O2(g) ➨ 2CO (g)

    • B. 

      Fe2O3(s) + 3CO(g) ➨2Fe(l) + 3CO2(g)

    • C. 

      CaCO3(s) ➨ CaO(s) + CO2(g)

    • D. 

      CaO(s) + SiO2(s) ➨ CaSiO3(s)

  • 25. 
    Which method of purification is represented by the following equation-
    • A. 

      Zone refining

    • B. 

      Van Arkel

    • C. 

      Poling

    • D. 

      Cupellation

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