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JEE Main201912 Apr 2019Evening ShiftChemistryGeneral Principles and Processes of Isolation of MetalsActual

The correct statement is:

Options

  1. APig iron is obtained from cast iron.
  2. BThe Hall-Heroult process is used for the production of aluminium and iron.
  3. Cleaching of bauxite using concentrated N a O H solution gives sodium aluminate and sodium silicate.
  4. Dthe blistered appearance of copper during the metallurgical process is due to the evolution of C O 2 .

Correct answer

C. leaching of bauxite using concentrated N a O H solution gives sodium aluminate and sodium silicate.

Step-by-step solution

(1) During leaching when bauxite is treated with concentrated N a O H , then sodium aluminate and sodium silicate is formed in the soluble form, whereas F e 2 O 3 is precipitated (2) The blistered appearance of copper during the metallurgical process is due to evolution of S O 2 . (3) Cast iron is obtained from pig iron. (4) Hall-Heroult process is used for production of only aluminium.

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