MHT CET · Chemistry · General Principles and Processes of Isolation of Metals
What is the product formed when bauxite ore is treated with sodium hydroxide?
- A Sodium meta aluminate
- B Aluminium hydroxide
- C Sodium aluminate
- D Sodium hydrogen carbonate
Answer & Solution
Correct Answer
(A) Sodium meta aluminate
Step-by-step Solution
Detailed explanation
Conc. sodium hydroxide.
Bauxite ore is finely divided and heated under pressure with concentrated caustic soda solution at \(150^{\circ} \mathrm{C}\) to obtain sodium meta-aluminate. The following reaction is as follows:
\(\underset{\text { Bauxite }}{\mathrm{Al}_{2} \mathrm{O}_{3} .2 \mathrm{H}_{2} \mathrm{O}+2 \mathrm{NaOH}} \stackrel{150^{0} \mathrm{C}}{\longrightarrow} 2 \mathrm{NaAlO}_{2}+\)\(\underset{\text { sodium meta aluminate }}{3 \mathrm{H}_{2} \mathrm{O}}\)
Bauxite ore is finely divided and heated under pressure with concentrated caustic soda solution at \(150^{\circ} \mathrm{C}\) to obtain sodium meta-aluminate. The following reaction is as follows:
\(\underset{\text { Bauxite }}{\mathrm{Al}_{2} \mathrm{O}_{3} .2 \mathrm{H}_{2} \mathrm{O}+2 \mathrm{NaOH}} \stackrel{150^{0} \mathrm{C}}{\longrightarrow} 2 \mathrm{NaAlO}_{2}+\)\(\underset{\text { sodium meta aluminate }}{3 \mathrm{H}_{2} \mathrm{O}}\)
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