Which of the following is possible at anode during electrolysis?

A(s) → A⁺ (aq) + e^-

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A⁺(aq) + e^- → A(s)

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A²⁺(aq) + e^- → A⁺(aq)

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A²⁺(aq) + 2e^- → A(s)

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Solution

The correct option is A
A(s) → A⁺ (aq) + e^-

At anode always oxidation reaction occurs.

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O_{2} (g)

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

M^{2 +} / M and M^{3 +} / M^{2 +}

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F e^{2 +} (a q) + 2 e^{-} \to F e (s); E^{0} = - 0.44 V F e^{3 +} (a q) + e^{-} \to F e^{2 +} (a q); E^{0} = + 0.77 V

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