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  • Manganese dioxide reacts with  in alkaline medium to form manganates. Choose the correct balanced reaction:</

Manganese dioxide reacts with \mathrm{O_{2}} in alkaline medium to form manganates.

Choose the correct balanced reaction:

Option: 1

\mathrm{MnO}_2+\mathrm{OH}^{-}+\mathrm{O}_2 \rightarrow \mathrm{MnO}_4{ }^{2-}+\mathrm{H}_2 \mathrm{O}


Option: 2

2 \mathrm{MnO}_2+2 \mathrm{OH}^{-}+\mathrm{O}_2 \rightarrow 2 \mathrm{MnO}_4^{2-}+\mathrm{H}_2 \mathrm{O}


Option: 3

\begin{aligned} & 2 \mathrm{MnO}_2+4 \mathrm{OH}^{-}+\mathrm{O}_2 \rightarrow 2 \mathrm{MnO}_4{ }^{2-}+2 \mathrm{H}_2 \mathrm{O} \\ \end{aligned}


Option: 4

2 \mathrm{MnO}_2+4 \mathrm{OH}^{-}+\mathrm{O}_2 \rightarrow 2 \mathrm{MnO}_4^{-}+2 \mathrm{H}_2 \mathrm{O}


Answers (1)

best_answer

The unbalanced equation is: \mathrm{MnO}_2+\mathrm{OH}^{-}+\mathrm{O}_2 \rightarrow \mathrm{MnO}_4{ }^{2-}

 Balancing the atoms and charges: 2 \mathrm{MnO}_2+4 \mathrm{OH}^{-}+\mathrm{O}_2 \rightarrow 2 \mathrm{MnO}_4{ }^{2-}

Adding water to balance out the oxygens: 2 \mathrm{MnO}_2+4 \mathrm{OH}^{-}+\mathrm{O}_2 \rightarrow 2 \mathrm{MnO}_4{ }^{2-}+2 \mathrm{H}_2 \mathrm{O}

Posted by

Ajit Kumar Dubey

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