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JIPMER2007ChemistrySome Basic Concepts of Chemistry

The mass of carbon anode consumed (giving only carbondioxide) in the production of 270 g of aluminium metal from bauxite by the Hall process is (Atomic mass Al =27 )

Options

  1. A180 g
  2. B270 g
  3. C540 g
  4. D90 g

Correct answer

D. 90 g

Step-by-step solution

In Hall and Heroult process aligned 2 Al ₂ O ₃ & 4 Al +3 O ₂ 4 C +3 O ₂ & 2 CO ₂+2 CO 2 Al ₂ O ₃+4 C & 4 Al +2 CO ₂+2 CO aligned Only for removal of CO ₂ , following equation is possible 2 Al ₂ O ₃+ 3 12=36 3 C 4 27=108 4 Al +3 CO ₂ For 108 g of Al , 36 ~g of C is required in above reaction. For 270 g of Al require amount of C = 36 108 270=90 ~g

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