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A mixture is heated with conc. \mathrm{H}_{2} \mathrm{SO}_{4} with \mathrm{MnO}_{2} and brown fumes are obtained. These brown fumes are formed due to

Option: 1

\mathrm{Br}^{-}


Option: 2

\mathrm{NO}_{3}^{-}


Option: 3

\mathrm{Cl}^{-}


Option: 4

\text{I}^{-}


Answers (1)

best_answer

The given reaction is a method for laboratory preparation of \text{Br}_{2}

The reaction is given below :

\begin{aligned} 2 \mathrm{KBr}+\mathrm{MnO}_{2}+\mathrm{H}_{2} \mathrm{SO}_{4} & \rightarrow \underset{\text { Brown gas }}{\mathrm{Br}_{2}}+2 \mathrm{KHSO}_{4}+\mathrm{MnSO}_{4} \end{aligned}

Hence, the correct answer is Option (1)

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