In a voltaic cell using copper and zinc as electrodes- which of the following is true- Copper acts as the positive electrode while zinc as negative-Zinc acts as the positive electrode while copper as negative-Zinc acts as a positive electrode when the thickness of zinc electrode is more-Copper acts as a positive electrode when the thickness of the copper electrode is more-

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Electrolytic Refining

In a voltaic ...

Question

In a voltaic cell using copper and zinc as electrodes, which of the following is true?

Copper acts as the positive electrode while zinc as negative.

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Zinc acts as the positive electrode while copper as negative.

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Zinc acts as a positive electrode when the thickness of zinc electrode is more.

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Copper acts as a positive electrode when the thickness of the copper electrode is more.

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Solution

The correct option is A
Copper acts as the positive electrode while zinc as negative.

At the zinc electrode, the zinc atoms get ionized and pass into solution as ${Z n}^{+ +}$ ions. This leaves the zinc rod with two electrons more, making it negative. Also, two hydrogen ions ( ${2 H}^{+}$ ) are discharged at the copper rod, by taking these two electrons. This makes the copper rod positive.

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