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(D) Statement $I$ is incorrect because in Hall's process,silica is removed as sodium silicate $(Na_2SiO_3)$ by treatment with $Na_2CO_3$.Statement $II

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Only $II$ and $III$ are correct

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(D) Statement $I$ is incorrect because in Hall's process,silica is removed as sodium silicate $(Na_2SiO_3)$ by treatment with $Na_2CO_3$.Statement $II$ is correct because Baeyer's process is used for red bauxite,which is contaminated with $Fe_2O_3$.Statement $III$ is correct because in Serpeck's process,$Al_2O_3$ is heated with $C$ and $N_2$ to form aluminum nitride $(AlN)$.The reactions in Serpeck's process are:$Al_2O_3 + 3C + N_2 \xrightarrow{1800^{\circ}C} 2AlN + 3CO$$AlN + 3H_2O \rightarrow Al(OH)_3 + NH_3$$2Al(OH)_3 \rightarrow Al_2O_3 + 3H_2O$

Observe the following statements regarding the purification of bauxite:
$I$. During Hall's process,silica is removed as $Si$ (vapour).
$II$. Bauxite ore contaminated with $Fe_2O_3$ is purified in Baeyer's process.
$III$. During Serpeck's process,$AlN$ is formed.
The correct answer is:

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Observe the following statements regarding the purification of bauxite:$I$. During Hall's process,silica is removed as $Si$ (vapour).$II$. Bauxite ore contaminated with $Fe_2O_3$ is purified in Baeyer's process.$III$. During Serpeck's process,$AlN$ is formed.The correct answer is: