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NTA Abhyas JEE Main2020ChemistryGeneral Principles and Processes of Isolation of MetalsPractice

The correct statement is

Options

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

Correct answer

A. leaching of bauxite using concentrated NaOH solution gives sodium aluminate and sodium silicate

Step-by-step solution

(1) During leaching when bauxite is treated with concentrated NaOH, 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 the evoluation of S O 2 . C u 2 S + 2C u 2 O → 6Cu + S O 2 (3) Cast iron is obtained from pig iron Pig iron 4 % → blast of air cast iron 3% (4) Hall-Heroult process is used for production of only aluminium.

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