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General Princip...

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  • Question 1
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    $$FeCr_2O_4$$ (Chromite) is a good source of chromium and its compound like $$Na_2CrO_4$$ and $$Na_2Cr_2O_7$$

    I.  $$FeCr_2O_4 + NaOH + air \longrightarrow (A) + Fe_2O_3$$

    II.  $$(A) + (B) \longrightarrow Na_2Cr_2O_7$$

    III.  $$Na_2Cr_2O_7 +  X \overset{\triangle}{\longrightarrow} Cr_2O_3$$

    IV.  $$Cr_2O_3 + Y \overset{\triangle}{\longrightarrow} Cr$$

    Compounds (A) and (B) are:

  • Question 2
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    From the Ellingham diagram, identify the oxide which is reduced by the carbon at highest temperature among the following oxides.

    $$MgO,$$ $$CaO,$$ $$TiO_2$$ and $$Al_2O_3$$ 

  • Question 3
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    Use the relationship $$\Delta \,G^{\circ}\,=\,- nFE^{\circ}_{cell}$$ to estimate the minimum voltage required to electrolyse $$Al_2O_3$$ in the Hall-Heroult process.

    $$\Delta G^{\circ}_{f}(Al_2O_3)\,=\,-1520\,kJ\,mol^{-1}$$

    $$\Delta G^{\circ}_{f}(CO_2)\,=\,-394\,kJ\,mol^{-1}$$

    The oxidation of the graphite anode to $$CO_2$$ permits the electrolysis to occur at a lower voltage than if the electrolysis reactions were :

    $$Al_2O_3\,\rightarrow\,2Al\,+\,3O_2$$.

    What is the approximate value of low voltage?

  • Question 4
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    Match column A (process) with column B (electrolyte).


      A (process)  B (electrolyte)
     (I) Downs Cell (W) Fused $$MgCl_2$$
     (II) Dow sea water  (X) Fused $$Al_2O_3 + Na_3AlF_6$$
     (III) Hall-Heroult (Y) Fused $$KHF_2$$
     (IV) Moissan (Z) Fused 40% NaCl + 60% CaCl$$_2$$
    Choose the correct alternative:

  • Question 5
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    $$\Delta G$$ vs $$T$$ plot in the Ellingham diagram slopes downward for the reaction.

  • Question 6
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    Directions For Questions

    Questions given below are based on the Periodic Table showing different ores/minerals.
    Primary mineral sources of metals. The s-block metals occur as chloride, silicates, and carbonates. The d- and p-block metals are found as oxides and sulphides, except for the group 3, metals, which occur as phoshates, and the platinum group metals and gold, which occur in uncombined form. There is no mineral source of technitium (Tc in group 7), a radioactive element that is made in nuclear reactors.

    ...view full instructions

    Elements found in native state are

  • Question 7
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    Froth flotation process which is used for the concentration of sulphide ore:

  • Question 8
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    Select correct statement:

  • Question 9
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    The chemical process in the production of steel from haematite ore involves ___________.

  • Question 10
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    Find out B in the given process.

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