An aqueous solution of FeSO_4,Al_2(SO_4)_3 an | vedclass

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(C) When the mixture is heated with excess $Na_2O_2$ (a strong oxidizing agent),the following reactions occur:$1$. $Fe^{2+}$ is oxidized to $Fe^{3+}$,

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$A$ yellow filtrate and a brown residue

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(C) When the mixture is heated with excess $Na_2O_2$ (a strong oxidizing agent),the following reactions occur:$1$. $Fe^{2+}$ is oxidized to $Fe^{3+}$,which then precipitates as brown $Fe(OH)_3$.$2$. $Al^{3+}$ forms soluble $[Al(OH)_4]^-$ (aluminate) in the filtrate.$3$. $Cr^{3+}$ (from chrome alum) is oxidized to $CrO_4^{2-}$ (chromate),which is yellow and soluble in the filtrate.Therefore,the filtrate contains $CrO_4^{2-}$ (yellow) and $[Al(OH)_4]^-$,while the residue contains $Fe(OH)_3$ (brown).

An aqueous solution of $FeSO_4$,$Al_2(SO_4)_3$ and chrome alum is heated with excess of $Na_2O_2$ and filtered. The materials obtained are

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