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JEE Advanced 2020Paper 2
Exam
JEE Advanced
Year
2020
Paper
Paper 2
Subject
Chemistry
Chapter
General Principles and Processes of Isolation of Metals

JEE Advanced 2020 · Paper 2 · Chemistry · General Principles and Processes of Isolation of Metals

Which among the following statement(s) is (are) true for the...

Which among the following statement(s) is (are) true for the extraction of aluminium from bauxite?

Options

  1. AHydrated Al2O3{Al}_{2}{O}_{3} precipitates, when CO2{CO}_{2} is bubbled through a solution of sodium aluminate.
  2. BAddition of Na3AlF6{Na}_{3}{AlF}_{6} lowers the melting point of alumina.
  3. CCO2{CO}_{2} is evolved at the anode during electrolysis.
  4. DThe cathode is a steel vessel with a lining of carbon.

Correct answer

A. Hydrated Al2O3{Al}_{2}{O}_{3} precipitates, when CO2{CO}_{2} is bubbled through a solution of sodium aluminate.

Step-by-step solution

(A) 2NaAlO2+3H2O+CO2⟶2Al(OH)3+Na2CO32{NaAlO}_{2} + 3{H}_{2}O + {CO}_{2} ⟶ 2Al ( OH{)}_{3} + {Na}_{2}{CO}_{3}

(B) In Hall-Heroult process Na3Al/F6{Na}_{3}Al / {F}_{6} and CaF2{CaF}_{2} is mixed with Al2O3{Al}_{2}{O}_{3} to lower melting point and increase conductivity.

(C) AnodeC(s)+2O2−(melt)→CO2(g)+4e−Anode\text{C} ( \text{s} ) + 2{\text{O}}^{2 -} ( \text{melt} ) \to {\text{CO}}_{2} ( \text{g} ) + 4{\text{e}}^{-}

(D) Steel cathode with carbon lining and graphite anode are used.

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