Which of the following reactions are disproportionation reactions-a 2Cu- - Cu2- - Cu0b 3MnO42- - 4H- - 2MnO4- -MnO2 - 2H2O c 2KMnO4 K2MnO4 - MnO2 - O2 d 2MnO4- - 3Mn2- - 2H2O - 5MnO2 - 4H-

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Oxidation and Reduction

Which of the ...

Question

Which of the following reactions are disproportionation reactions?
a) $2 C u^{+}$ $\to$ $C u^{2 +}$ + $C u^{0}$

b) $3 M n O_{4}^{2 -}$ + $4 H^{+}$ $\to$ $2 M n O_{4}^{-}$ + $M n O_{2}$ + $2 H_{2} O$

c) $2 K M n O_{4}$ $△ - \to$ $K_{2} M n O_{4}$ + $M n O_{2}$ + $O_{2}$

d) $2 M n O_{4}^{-}$ + $3 M n^{2 +}$ + $2 H_{2} O$ $⟶$ $5 M n O_{2}$ + $4 H^{+}$

(a) and (b) only

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(a), (b) and (c)

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(a), (c) and (d)

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(a) and (d) only

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2 C u^{+}

\to

C u^{2 +}

C u^{0}

3 M n O_{4}^{2 -}

4 H^{+}

\to

2 M n O_{4}^{-}

M n O_{2}

2 H_{2} O

2 K M n O_{4}

△ - \to

K_{2} M n O_{4}

M n O_{2}

O_{2}

2 M n O_{4}^{-}

3 M n^{2 +}

2 H_{2} O

⟶

5 M n O_{2}

4 H^{+}

(a) 2 C u^{+} \to C u^{2 +} + C u (b) 3 M n O_{4}^{2 -} + 4 H^{+} \to 2 M n O_{4}^{-} + M n O_{2} + 2 H_{2} O (c) 2 K M n O_{4} \to K_{2} M n O_{4} + M n O_{2} + O_{2} (d) 2 M n O_{4}^{-} + 3 M n^{2 +} + 2 H_{2} O \to 5 M n O_{2} + 4 H^{+}

C u^{+} \to C u^{2 +} + C u

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

2 K M n O_{4} \to K_{2} M n O_{4} + M n O_{2} + O_{2}

2 M n O_{4}^{-} + 3 M n^{+ 2} + 2 H_{2} O \to 5 M n O_{2} + 4 H^{+}

C u^{+} \to C u^{2 +} + C u

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

2 K M n O_{4} \to K_{2} M n O_{4} + M n O_{2} + O_{2}

2 M n O_{4}^{-} + 3 M n^{2 +} + 2 H_{2} O \to 5 M n O_{2} + 4 H^{+}

3 M n O_{4}^{2 -} + 4 H^{+} ⟶ M n O_{2} + 2 M n O_{4}^{-} + 2 H_{2} O

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