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In the ionic equation
$-\mathrm{BiO}_{3}^{-}+6 \mathrm{H}^{+}+x e^{-} \longrightarrow \mathrm{Bi}^{3+}+3 \mathrm{H}_{2} \mathrm{O}, \quad$ the values of $x$ is
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$-\mathrm{BiO}_{3}^{-}+6 \mathrm{H}^{+}+x e^{-} \longrightarrow \mathrm{Bi}^{3+}+3 \mathrm{H}_{2} \mathrm{O}, \quad$ the values of $x$ is
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$\mathrm{BiO}_{3}^{-}+6 \mathrm{H}^{+}+2 \mathrm{e}^{-} \longrightarrow \mathrm{Bi}^{3+}+3 \mathrm{H}_{2} \mathrm{O}$
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