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No. It seems Zinc would always act as the negative terminal. Anode and Cathode are the terms used when we connect an external electrical source to the device. If positive terminal of an external battery is connected to the electrode then that electrode is named as ANODE. If negative terminal is connected then it is named as CATHODE.

In case of chargable device, while discharging say P acts as negative terminal. Then while charging this negative terminal would be the anode.

So if the device is a chargable one and Zn acts as negative terminal while delivering current to the external load, then the same zn would acts as anode while charging.

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Why does the graphite rod act as a positive terminal where as the zinc casing a negative terminal?

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