Which of the following equations are not balanced:

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$5 B i {O_{3}}^{-} + 22 H^{+} + M n^{2 +} \underset{}{\to} 5 B i^{3 +} + 7 H_{2} O + M n {O_{4}}^{-}$

$2 B i {O_{3}}^{-} + 4 H^{+} + M n^{2 +} \underset{}{\to} 2 B i^{3 +} + 2 H_{2} O + M n {O_{4}}^{-}$

$6 B i {O_{3}}^{-} + 12 H^{+} + 3 M n^{2 +} \underset{}{\to} 6 B i^{3 +} + 6 H_{2} O + 3 M n {O_{4}}^{-}$

$5 B i {O_{3}}^{-} + 14 H^{+} + 2 M n^{2 +} \underset{}{\to} 5 B i^{3 +} + 7 H_{2} O + 2 M n {O_{4}}^{-}$

answer is A, C, D.

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Detailed Solution

$\begin{array}{l} (i) 2 e + 6 H^{+} + B i {O_{3}}^{-} \overset{}{\to} B i^{3 +} + 3 H_{2} O \\ (i i) 4 H_{2} O + M n^{2 +} \overset{}{\to} M n {O_{4}}^{-} + 8 H^{+} + 5 e \\ (i) \times 5 + (i i) \times 2, w e g e t 14 H^{+} + 5 B i {O_{3}}^{-} + 5 M n^{2 +} \overset{}{\to} 5 B i^{3 +} + 2 M n {O_{4}}^{-} + 7 H_{2} O \end{array}$

Hence, (2) is the correct balanced reaction

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