JEE Main 202125 JulyMorning Shift

Exam: JEE Main
Year: 2021
Date: 25 July
Shift: Morning Shift
Subject: Chemistry
Chapter: General Principles and Processes of Isolation of Metals

JEE Main 2021 · 25 July · Morning Shift · Chemistry · General Principles and Processes of Isolation of Metals

In the leaching of alumina from bauxite, the ore expected to leach...

In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with

NaOH

is :

Options

A ${TiO}_{2}$
B ${Fe}_{2}{O}_{3}$
C $ZnO$
D ${SiO}_{2}$

Correct answer

D. ${SiO}_{2}$

Step-by-step solution

In bauxite impurities of ${Fe}_{2}{O}_{3}, {TiO}_{2}$ and ${SiO}_{2}$ are present, ${Fe}_{2}{O}_{3}$ and ${TiO}_{2}$ are basic oxides therefore does not reacts with or dissolve in $NaOH$ whereas ${SiO}_{2}$ is acidic oxide it gets dissolve in $NaOH$ , hence leach out

${SiO}_{2} + 2NaOH \to {Na}_{2}{SiO}_{3}\left(aq .\right) + {H}_{2}O$

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