Which one of the following is true?

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(A) In the Bayer's process,$NaOH$ is used to leach bauxite ore $(Al_2O_3 \cdot 2H_2O)$ to separate it from impurities like $Fe_2O_3$ and $SiO_2$.$NaOH

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$NaOH$ is used in the concentration of bauxite ore

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(A) In the Bayer's process,$NaOH$ is used to leach bauxite ore $(Al_2O_3 \cdot 2H_2O)$ to separate it from impurities like $Fe_2O_3$ and $SiO_2$.$NaOH$ is not a primary standard because it is hygroscopic and absorbs $CO_2$ from the air.Manganous hydroxide,$Mn(OH)_2$,is insoluble in excess $NaOH$.$NaOH$ reacts with $Cl_2$ to form sodium chloride and sodium hypochlorite or chlorate depending on the temperature.

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