About ......., % impurity remains in alumina | vedclass

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(A) Bayer's process is used for the purification of bauxite ore to obtain pure alumina $(Al_2O_3)$.In this process,the bauxite ore is treated with a c

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$0.5$

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(A) Bayer's process is used for the purification of bauxite ore to obtain pure alumina $(Al_2O_3)$.In this process,the bauxite ore is treated with a concentrated solution of sodium hydroxide $(NaOH)$ at high temperature and pressure.The impurities like silica,iron oxide,and titanium oxide are removed during the process.The final alumina obtained after calcination is highly pure,typically containing about $99.5\%$ pure $Al_2O_3$.Therefore,the impurity remaining in the alumina is approximately $100\% - 99.5\% = 0.5\%$.

About $.......\, \%$ impurity remains in alumina obtained by Bayer's method. (in $\%$)

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