In the Bayer process,what is obtained when co | vedclass

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(B) The $Bayer$ process is the principal industrial means of refining bauxite to produce alumina $(Al_2O_3)$.In this process,finely ground bauxite ore

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Sodium aluminate

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(B) The $Bayer$ process is the principal industrial means of refining bauxite to produce alumina $(Al_2O_3)$.In this process,finely ground bauxite ore is digested with a hot concentrated solution of $NaOH$ under pressure.The $Al_2O_3$ present in the bauxite reacts with $NaOH$ to form soluble sodium aluminate ($NaAlO_2$ or $Na[Al(OH)_4]$).The chemical reaction is: $Al_2O_3(s) + 2NaOH(aq) + 3H_2O(l) \rightarrow 2Na[Al(OH)_4](aq)$.

In the $Bayer$ process,what is obtained when concentrated $NaOH$ is added to bauxite?

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$Al_{2}O_{3(s)} + 2NaOH_{(aq)} \xrightarrow{\Delta} \dots + H_{2}O_{(l)}$

$(i)$ Explain the steps for extraction of copper from its sulphide ore. Write the balanced equations involved in the process.
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