Question

Which of the following reaction does not take place during leaching for concentration of bauxite?

• A. $Al_{2}O_{3} + 2NaOH + 3H_{2}O \rightarrow 2Na\lbrack Al(OH)_{4}\rbrack$
• B. $2Na\lbrack Al(OH)_{4}\rbrack + CO_{2} \rightarrow Al_{2}O_{3}.xH_{2}O + 2NaHCO_{3}$
• C. $Al_{2}O_{3}.2H_{2}O\overset{\quad\Delta\quad}{\rightarrow}Al_{2}O_{3} + 2H_{2}O$
• D. $Al_{2}O_{3}.xH_{2}O\overset{\quad\Delta\quad}{\rightarrow}Al_{2}O_{3} + xH_{2}O$

Answer 1

Answer: (C)

$Al_{2}O_{3}.2H_{2}O\overset{\quad\Delta\quad}{\rightarrow}Al_{2}O_{3} + 2H_{2}O$

Answer 2

$Al_{2}O_{3}.2H_{2}O\overset{\quad\Delta\quad}{\rightarrow}Al_{2}O_{3} + 2H_{2}O$