Which of the following is true regarding a Leclanche Cell?

The carbon rod acts as the positive electrode and zinc as negative; the electrolyte used is NH₄Cl.

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The zinc rod acts as the positive electrode and carbon as negative; the electrolyte used is NH₄Cl.

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The carbon rod acts as the positive electrode and zinc as negative; the electrolyte used is H₂SO₄.

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The zinc rod acts as the positive electrode and carbon as negative; the electrolyte used is H₂SO₄.

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Solution

The correct option is A
The carbon rod acts as the positive electrode and zinc as negative; the electrolyte used is NH₄Cl.

A Leclanche cell consists of a glass vessel which is filled with an ammonium chloride ( ${N H}_{4} C l$ ) solution which acts as the electrolyte. In it, there stands a zinc rod and porous pot containing a carbon rod which is packed around with a mixture of manganese dioxide and powdered carbon. The carbon acts as the positive electrode and zinc as the negative electrode.

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In the process of purification of copper metal, a thin plate of pure copper and a thick rod of impure copper are used as electrodes, and a metal salt solution is used as an electrolyte :
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