Q16 of 52 Page 80

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

Al2O3 is a bad conductor of electricity and have very high meting point.


Thus, CaF2 and Na3AlF6 are used in Hall-Heroult’s process to extract Al from Al2O3. They lower the melting point of Al2O3 and increase the conductivity of the molten mixture.

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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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Which of the following options are correct?

 17

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

 18

In the Froth Floatation process, zinc sulphide and lead sulphide can be separated by ______________.