UNITWISE EVALUATION AND ADDITIONAL QUESTIONS 12.08.2019آ  Using the Ellingham diagram A) predict...

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  • 1

    UNITWISE

    EVALUATION AND ADDITIONAL

    QUESTIONS

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  • 2

    1. METALLURGY

    EVALUATION :

    Answer the following questions briefly: ( 2 or 3 Marks)

    1. What are the differences between minerals and ores? ( Volume I - Page No : 2 )

    2. What are the various steps involved in extraction of pure metals from their ores? ( 2 )

    3. What is the role of limestone in the extraction of iron from its oxide Fe2O3? ( 8 )

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

    ores. ( 4 )

    5. Out of coke and carbon monoxide, which is better reducing agent for the reduction of zinc

    oxide. Why? ( Creative )

    6. Describe a method for refining Nickel ( 16 )

    7. Explain zone refining process with an example ( 16 )

    8. Give the uses of zinc ( 17 )

    9. Explain the following terms with example i) gangue ii) slag ( Creative )

    10. Give the basic requirement for vapour phase refining ( 16 )

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

    example ( 10, 11 )

    12. Give the limitations of Ellingham diagram ( 13 )

    Answer the following questions in detail : ( 5 Marks)

    1. Using the Ellingham diagram 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 983 K but this

    temperature, the reverse is true. Explain

    C) it is possible to reduce Fe2O3 by coke at the temperature around 1200 K ( Creative )

    2. Explain the electrometallurgy of Aluminium ( 14 )

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