Concentrated H_2SO_4 is not used to prepare H | vedclass

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(A) When $KBr$ reacts with concentrated $H_2SO_4$,$HBr$ is initially formed: $KBr + H_2SO_4 	o KHSO_4 + HBr$. However,concentrated $H_2SO_4$ is a str

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Oxidizes $HBr$ to $Br_2$

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(A) When $KBr$ reacts with concentrated $H_2SO_4$,$HBr$ is initially formed: $KBr + H_2SO_4 	o KHSO_4 + HBr$. However,concentrated $H_2SO_4$ is a strong oxidizing agent. It further oxidizes the produced $HBr$ to $Br_2$ gas: $2HBr + H_2SO_4 	o Br_2 + SO_2 + 2H_2O$. Therefore,it cannot be used to prepare pure $HBr$.

Concentrated $H_2SO_4$ is not used to prepare $HBr$ from $KBr$ because it

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