Which of the following represents the anode half-cell reaction for the following galvanic cell: $C u (s) | C u^{2 +} (a q) | | A g^{+} (a q) | A g (s)$

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

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C u (s) \to C u^{2 +} (a q) + 2 e^{-}

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

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

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Solution

The correct option is B $C u (s) \to C u^{2 +} (a q) + 2 e^{-}$
Reduction reaction takes place at cathode and oxidation reaction takes place at anode.
Cathode $: 2 A g^{+} (a q) + 2 e^{-} \to 2 A g (s)$
Anode $: C u (s) \to C u^{2 +} (a q) + 2 e^{-}$
Cell reaction $: C u (s) + 2 A g^{+} (a q) \to C u^{2 +} (a q) + 2 A g (s)$

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