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Chemical Engineering :: Chemical Process

  1. Pig iron is produced by blast furnaces in India using mostly the iron ore named

  2. A.

     Hematite

    B.

     Magnetite

    C.

     Siderite

    D.

     Chalcopyrite


  3. In multistage equilibrium conversion of SO₂ to SO₃ (2SO₂ + O₂ ⇋ 2SO₃), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO₂ to SO₃ can be increased by

  4. A.

     Increasing the oxygen concentration

    B.

     Putting more quantity of V₂O₅ catalyst in the converter

    C.

     Removing some quantity of SO₃ during intermediate stage

    D.

     Maintaining low temperature & pressure in the converter


  5. Which of the following is used as a binding material in soap to improve soap texture?

  6. A.

     Rosin

    B.

     Borax

    C.

     Benzyl acetate

    D.

     Sodium carbonate


  7. Soaps remove dirt by

  8. A.

     Increasing the surface tension

    B.

     Decreasing wettability

    C.

     Supplying hydrophyllic group

    D.

     None of these


  9. Which allotrope of sulphur is insoluble in carbon disulphide?

  10. A.

     Rhombic sulphur

    B.

     Monoclinic sulphur

    C.

     Plastic sulphur

    D.

     Milk of sulphur


  11. Solvent extracted oil

  12. A.

     Has low free fatty acid content

    B.

     Is odourless

    C.

     Has more of unsaturates

    D.

     None of these


  13. Pick out the wrong statement.

  14. A.

     Strongly caking coal should not be used in the Lurgi gasifier

    B.

     Acetylene gas can not be used for illumination purpose

    C.

     Water gas is called blue gas because of the color of the flame, when it is burnt

    D.

     Gaseous fuels require less percentage of excess air for combustion as compared to liquid fuels


  15. Solvay process is not used for the manufacture of potassium carbonate, because of the reason that potassium bicarbonate

  16. A.

     Is prone to thermal decomposition

    B.

     Has high water solubility and is unstable

    C.

     Is soluble in ammonium chloride and potassium chloride solution

    D.

     All of the above


  17. Transparent soaps (e.g. Pears) are

  18. A.

     Usually soft soap (made from coconut oil) in which cane sugar & alcohol are added and finally washed with methylated spirit to achieve transparency

    B.

     Metallic soaps with frothing agent and free stearic acid to achieve transparency

    C.

     Metallic soaps with frothing agent from which glycerine has not been recovered

    D.

     None of these


  19. Most widely and commonly used coagulant for the removal of suspended impurities in water is

  20. A.

     Bleaching powder

    B.

     Slaked lime

    C.

     Alum

    D.

     Copper sulphate