Q30 / 76 · NTA Abhyas (JEE Main) 2020 · Chemistry · General Principles and Processes of Isolation of Metals

The correct statement is

  • Correct answer
    A
    leaching of bauxite using concentrated NaOH solution gives sodium aluminate and sodium silicate
  • B
    the blistered appearance of copper during the metallurgical process is due to the evolution of CO2
  • C
    pig iron is obtained from cast iron
  • D
    the Hall-Heroult process is used for the production of aluminium and iron

Solution

(1) During leaching when bauxite is treated with concentrated NaOH, then sodium aluminate and sodium silicate is formed in the soluble form, whereas Fe2O3 is precipitated.

(2) The blistered appearance of copper during the metallurgical process is due to the evoluation of SO2 .

Cu2S+2Cu2O→6Cu+SO2

(3) Cast iron is obtained from pig iron

Pig iron4% →blast of air cast iron3%

(4) Hall-Heroult process is used for production of only aluminium.

Hence, the correct answer is option: 'A'.

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