General Principles and processes of Isolation of Elements
medium

बॉक्साइट से ऐलुमिना के निक्षालन में वह अयस्क जिसका $NaOH$ की अभिक्रिया में निक्षालित होना अपेक्षित है, वह है

A

$\mathrm{TiO}_{2}$

B

$\mathrm{SiO}_{2}$

C

$\mathrm{Fe}_{2} \mathrm{O}_{3}$

D

$ZnO$

(JEE MAIN-2021)

Solution

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

$\mathrm{SiO}_{2}+2 \mathrm{NaOH} \rightarrow \mathrm{Na}_{2} \mathrm{SiO}($ aq. $)+\mathrm{H}_{2} \mathrm{O}$

Standard 12
Chemistry

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