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AP EAMCET202018 Sep 2020Evening ShiftChemistryGeneral Principles and Processes of Isolation of MetalsActual

Which statement is incorrect regarding Hall-Heroult process for metallurgy of aluminium? 1. Use of ( Na ₃ AlF ₆ ) lowers the melting point of ( Al ₂ O ₃ ) 2. Steel vessel with lining of carbon acts as cathode. 3. Graphite is used as anode. 4. Carbon dioxide gas is generated at cathode.

Options

  1. A1
  2. B2
  3. C3
  4. D4

Correct answer

D. 4

Step-by-step solution

In Hall-Heroult process for extraction of aluminium (crude) from alumina ( ( Al ₂ O ₃ ) ). Statements (1), (2) and (3) are correct because cryolite ( ( Na ₃ AlF ₆ ) ) is added to ( Al ₂ O ₃ ) to lower, its melting point. Here, steel vessel with lining of carbon acts as cathode and graphite acts as anode, but statement (4) is incorrect because ( Al ) gets deposited at cathode.

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