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JEE Main 201912 AprilEvening Shift
Exam
JEE Main
Year
2019
Date
12 April
Shift
Evening Shift
Subject
Chemistry
Chapter
General Principles and Processes of Isolation of Metals

JEE Main 2019 · 12 April · Evening Shift · Chemistry · General Principles and Processes of Isolation of Metals

The correct statement is:

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 NaOHNaOH solution gives sodium aluminate and sodium silicate.
  4. Dthe blistered appearance of copper during the metallurgical process is due to the evolution of CO2.C{O}_{2} .

Correct answer

C. leaching of bauxite using concentrated NaOHNaOH solution gives sodium aluminate and sodium silicate.

Step-by-step solution

(1) During leaching when bauxite is treated with concentrated NaOH,NaOH, then sodium aluminate and sodium silicate is formed in the soluble form, whereas Fe2O3F{e}_{2}{O}_{3} is precipitated
(2) The blistered appearance of copper during the metallurgical process is due to evolution of SO2.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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