Q32 / 180 · KCET 2016 · Chemistry

The complex formed when \( \mathrm{Al}_{2} \mathrm{O}_{3} \) is leached from Bauxite using concentrated \( \mathrm{NaOH} \) solution
is,

  • Correct answer
    A
    \( N a\left[A l(O H)_{4}\right] \)
  • B
    \( \mathrm{NaAl}_{2} \mathrm{O}_{4} \)
  • C
    \( \mathrm{Na}_{2}\left[\mathrm{Al}(\mathrm{OH})_{3}\right] \)
  • D
    \( \mathrm{Na}_{2} \mathrm{AlO}_{2} \)

Solution

When \( \mathrm{Al}_{2} \mathrm{O}_{3} \) is leached from bauxite using concentrated \( \mathrm{NaOH} \) solution, the complex formed is \( \mathrm{Na}\left[\mathrm{Al}(\mathrm{OH})_{4}\right] \)
The reaction involved in leaching from bauxite ore is,
\( \mathrm{Al}_{2} \mathrm{O}_{3} \cdot 2 \mathrm{H}_{2} \mathrm{O}+2 \mathrm{NaOH}+3 \mathrm{H}_{2} \mathrm{O}-{ }^{473-523 k}->\mathrm{Na}\left[\mathrm{Al}(\mathrm{OH})_{4}\right] \)

Hence, the correct answer is option: 'A'.

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