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Which of the following equations is a balanced one:
(1) \( 5 \mathrm{BiO}_{3}{ }^{-}+22 \mathrm{H}^{+}+\mathrm{Mn}^{2+} \longrightarrow 5 \mathrm{Bi}^{3+}+7 \mathrm{H}_{2} \mathrm{O}+\mathrm{MnO}_{4}{ }^{-} \)
\( \mathrm{P} \)
(2) \( 5 \mathrm{BiO}_{3}{ }^{-}+14 \mathrm{H}^{+}+2 \mathrm{Mn}^{2+} \longrightarrow 5 \mathrm{Bi}^{3+}+7 \mathrm{H}_{2} \mathrm{O}+2 \mathrm{MnO}_{4}^{-} \)
W
(3) \( 2 \mathrm{BiO}_{3}-+4 \mathrm{H}^{+}+\mathrm{Mn}^{2+} \longrightarrow 2 \mathrm{Bi}^{3+}+2 \mathrm{H}_{2} \mathrm{O}+\mathrm{MnO}_{4}{ }^{-} \)
(4) \( 6 \mathrm{BiO}_{3}{ }^{-}+12 \mathrm{H}^{+}+3 \mathrm{Mn}^{2+} \longrightarrow 6 \mathrm{Bi}^{3+}+6 \mathrm{H}_{2} \mathrm{O}+3 \mathrm{MnO}_{4}^{-} \)
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