AP EAMCET · Chemistry · General Principles and Processes of Isolation of Metals
The pair of oxides, which can be leached out, when powdered bauxite containing certain impurities is digested with concentrated solution of \(\mathrm{NaOH}\) at \(473-523 \mathrm{~K}\) temperature and \(35-36\) bar pressure are
- A \(\mathrm{TiO}_2, \mathrm{SiO}_2\)
- B \(\mathrm{SiO}_2, \mathrm{Al}_2 \mathrm{O}_3\)
- C \(\mathrm{SiO}_2, \mathrm{Fe}_2 \mathrm{O}_3\)
- D \(\mathrm{Al}_2 \mathrm{O}_3, \mathrm{Fe}_2 \mathrm{O}_3\)
Answer & Solution
Correct Answer
(B) \(\mathrm{SiO}_2, \mathrm{Al}_2 \mathrm{O}_3\)
Step-by-step Solution
Detailed explanation
Bauxite is the most important ore of aluminium contains only \(30-60 \% \mathrm{Al}_2 \mathrm{O}_3\), the rest being a mixture of \(\mathrm{SiO}_2, \mathrm{Fe}_2 \mathrm{O}_3\) and \(\mathrm{TiO}_2\). The powdered bauxite is treated with concentrated solution of…
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