Which of the following is comproportionation reaction?

C l_{2} (g) + O H^{-} (a q) \to C l O_{3}^{-} (a q) + C l^{-} (a q) + H_{2} O (l)

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A g^{2 +} + A g \to 2 A g^{+}

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N a + H_{2} O \to N a O H + H_{2}

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Z n + C u S O_{4} \to Z n S O_{4} + C u

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Solution

The correct option is B $A g^{2 +} + A g \to 2 A g^{+}$
Comproportionation reaction is the opposite of disproportionation reaction. In this reaction, two reactants containing the same element (with different oxidation states) chemically combine to form a product having the same oxidation state of that element.
Thus, the two reactants containing silver with $0$ and $+ 2$ oxidation states chemically combine to form two silver ions having $+ 1$ oxidation state.

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The standard oxidation potential of zinc and silver in water at 298 K are

Which of the following reactions actually take place

A g^{2 +} (a q) + A g (s) \to 2 A g^{+} (a q)

△ G^{\circ}

Z n (s) + A g_{2} O (s) + H_{2} O (l) ⇌ Z n^{2 +} (a q) + 2 A g (s) + 2 O H^{-} (a q)

E_{A g^{+} / A g}^{\circ} = + 0.80 V

E_{Z n^{2 +} / Z N}^{\circ} = - 0.76 V

C u (s) | C u^{2 +} (a q) | | A g^{+} (a q) | A g (s)

C u (s) | C u^{2 +} (a q) | | A g^{+} (a q) | A g (s)

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