Q15 of 52 Page 80

Which of the following options are correct?

Cast iron is made by melting pig iron with scrap iron and coke using hot air blast.


Van Arkel process


Impure Zr or Ti is heated with Iodine in an evacuated vessel and it forms a volatile complex which on decomposition gives the pure metal.


Zr + 2I2→ ZrI4


ZrI4→Zr(pure) + 2I2 (at 1800K)

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13


For the reduction of FeO at the temperature corresponding to point D, which of the following statements is correct?


 14


At the temperature corresponding to which of the points in Fig, FeO will be reduced to Fe by coupling the reaction 2FeO → 2Fe + O2 with all of the following reactions?


(a) C + O2→ CO2


(b) 2C + O2→ 2CO and


(c) 2CO + O2→2 CO2


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In the extraction of aluminium by Hall-Heroult process, purified Al2O3 is mixed with CaF2 to

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Which of the following statements is correct about the role of substances added in the froth floation process?