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Z n (s) | Z n^{2 +} (a q) | | C u^{2 +} | C u (s)

The Zn electrode is the cathode

Oxidation takes place at the Cu electrode

T h e r e a c t i o n Z n_{2} + (a q) + C u (s) \to Z n (s) + C u_{2} + (a q) i s s p o n \tan e o u s

Electron flows from the Zn electrode to the Cu electrode

ANS : 4

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